我使用以下命令在 Ubuntu 18.04.1 LTS Bionic Beaver 上安装 Atom 文本编辑器：-
sudo apt-get install atom
我停止了安装过程，现在每当我运行命令时：-
sudo apt update
输出如下：-
Hit:1 http://ppa.launchpad.net/webupd8team/atom/ubuntu bionic InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
每当我尝试再次安装 Atom 时，我都会得到以下输出：-
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
atom : Depends: gvfs-bin but it is not installable
E: Unable to correct problems, you have held broken packages.
现在，每当我尝试使用以下命令从终端安装软件包时：
sudo apt-get install "package-name"
我得到一些输出显示：此包没有安装候选。
例如，如果我安装 rpm，输出为：-
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package rpm is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'rpm' has no installation candidate
[*编辑] 现在，当我运行时sudo apt update一切都很好，但最后有一个奇怪的输出：-
E: Some index files failed to download. They have been ignored, or old ones used instead.
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target Translations (main/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target DEP-11 (main/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target CNF (main/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target Packages (restricted/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target Packages (restricted/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target Translations (restricted/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target Translations (restricted/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target DEP-11 (restricted/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target DEP-11 (restricted/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target DEP-11-icons (restricted/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target CNF (restricted/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target CNF (restricted/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:5 and /etc/apt/sources.list.d/official-package-repositories.list:5
W: Target Packages (universe/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target Packages (universe/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target Translations (universe/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target Translations (universe/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target DEP-11 (universe/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target DEP-11 (universe/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target DEP-11-icons (universe/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target CNF (universe/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target CNF (universe/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:16 and /etc/apt/sources.list.d/official-package-repositories.list:16
W: Target Packages (multiverse/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target Packages (multiverse/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target Translations (multiverse/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target Translations (multiverse/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target DEP-11 (multiverse/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target DEP-11 (multiverse/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target DEP-11-icons (multiverse/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target CNF (multiverse/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target CNF (multiverse/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:26 and /etc/apt/sources.list.d/official-package-repositories.list:26
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target Translations (main/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target DEP-11 (main/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target CNF (main/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target Packages (restricted/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target Packages (restricted/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target Translations (restricted/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target Translations (restricted/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target DEP-11 (restricted/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target DEP-11 (restricted/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target DEP-11-icons (restricted/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target CNF (restricted/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target CNF (restricted/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:10 and /etc/apt/sources.list.d/official-package-repositories.list:10
W: Target Packages (universe/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target Packages (universe/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target Translations (universe/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target Translations (universe/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target DEP-11 (universe/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target DEP-11 (universe/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target DEP-11-icons (universe/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target CNF (universe/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target CNF (universe/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/official-package-repositories.list:18
W: Target Packages (multiverse/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target Packages (multiverse/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target Translations (multiverse/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target Translations (multiverse/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target DEP-11 (multiverse/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target DEP-11 (multiverse/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target DEP-11-icons (multiverse/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target CNF (multiverse/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target CNF (multiverse/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:28 and /etc/apt/sources.list.d/official-package-repositories.list:28
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Translations (main/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11 (main/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target CNF (main/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Packages (restricted/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Packages (restricted/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Translations (restricted/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Translations (restricted/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11 (restricted/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11 (restricted/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11-icons (restricted/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target CNF (restricted/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target CNF (restricted/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Packages (universe/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Packages (universe/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Translations (universe/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Translations (universe/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11 (universe/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11 (universe/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11-icons (universe/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target CNF (universe/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target CNF (universe/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Packages (multiverse/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Packages (multiverse/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Translations (multiverse/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Translations (multiverse/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11 (multiverse/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11 (multiverse/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target DEP-11-icons (multiverse/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target CNF (multiverse/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target CNF (multiverse/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:36 and /etc/apt/sources.list.d/official-package-repositories.list:36
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target Translations (main/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target DEP-11 (main/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target CNF (main/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target Packages (restricted/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target Packages (restricted/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target Translations (restricted/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target Translations (restricted/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target DEP-11 (restricted/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target DEP-11 (restricted/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target DEP-11-icons (restricted/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target CNF (restricted/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target CNF (restricted/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:46 and /etc/apt/sources.list.d/official-package-repositories.list:46
W: Target Packages (universe/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target Packages (universe/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target Translations (universe/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target Translations (universe/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target DEP-11 (universe/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target DEP-11 (universe/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target DEP-11-icons (universe/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target CNF (universe/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target CNF (universe/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:48 and /etc/apt/sources.list.d/official-package-repositories.list:48
W: Target Packages (multiverse/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
W: Target Packages (multiverse/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
W: Target Translations (multiverse/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
W: Target Translations (multiverse/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
W: Target DEP-11 (multiverse/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
W: Target DEP-11 (multiverse/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
W: Target DEP-11-icons (multiverse/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
W: Target CNF (multiverse/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
W: Target CNF (multiverse/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:50 and /etc/apt/sources.list.d/official-package-repositories.list:50
答案1
看起来主存储库列表文件已被删除。
以下命令将提供/etc/apt/sources.list从下载的 Ubuntu 18.04 LTS 映像文件中获取的原始基础文件。
sudo echo -e "# Sources.list obtained directly from the downloaded Ubuntu iso image file\ndeb http://archive.ubuntu.com/ubuntu/ bionic main restricted\ndeb http://security.ubuntu.com/ubuntu/ bionic-security main restricted\ndeb http://archive.ubuntu.com/ubuntu/ bionic-updates main restricted" > /etc/apt/sources.list
创建主存储库源文件后，您将需要更新apt-cache：
sudo apt-get update
此时，您可能会收到错误消息，具体取决于您的某些 PPA 是否与主存储库冲突。建议在尝试修复存储库问题之前禁用所有 PPA。但是，如果从各个 PPA 安装的某些软件需要比官方 Ubuntu 更新的库，这也可能会产生错误。
如果更新时没有遇到任何错误，则可能没问题。但是，您可能需要启用下面限制较少的存储库列表。您可以将 的内容替换/etc/apt/sources.list为以下存储库列表：
#deb cdrom:[Ubuntu 18.04 LTS _Bionic Beaver_ - Release amd64 (20180426)]/ bionic main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://us.archive.ubuntu.com/ubuntu/ bionic main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ bionic universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic universe
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://us.archive.ubuntu.com/ubuntu/ bionic multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic multiverse
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu bionic partner
# deb-src http://archive.canonical.com/ubuntu bionic partner
deb http://security.ubuntu.com/ubuntu bionic-security main restricted
# deb-src http://security.ubuntu.com/ubuntu bionic-security main restricted
deb http://security.ubuntu.com/ubuntu bionic-security universe
# deb-src http://security.ubuntu.com/ubuntu bionic-security universe
deb http://security.ubuntu.com/ubuntu bionic-security multiverse
# deb-src http://security.ubuntu.com/ubuntu bionic-security multiverse
外部链接：
答案2
@RubberStamp ...我无法在评论部分发表评论。它说用户无权对此帖子发表评论。
无论如何，不仅对于atom，而且对于我尝试安装的任何包，输出都是
E: Unable to locate package "package-name"
或者
E: Package "package-name" has no installation candidate