在过去的几天里，每次我尝试安装一个新应用程序时，我都会得到
ubuntu unable to install:
cannot perform the following task:
... 没有列出应用程序名称或任务。我试过了
sudo apt update
sudo apt upgrade
sudo apt autoremove
之后没有更好的结果。作为新手，我不知道下一步该尝试什么。有什么想法吗？
在此先感谢您的帮助！
经过几次交流后，我被建议添加以下信息：
猫/etc/apt/sources.list
# deb cdrom:[Ubuntu 16.04.2 LTS _Xenial Xerus_ - Release amd64 (20170215.2)]/ xenial main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu bionic main restricted
# deb-src http://fr.archive.ubuntu.com/ubuntu/ xenial main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu bionic-updates main restricted
# deb-src http://fr.archive.ubuntu.com/ubuntu/ xenial-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://archive.ubuntu.com/ubuntu bionic universe
# deb-src http://fr.archive.ubuntu.com/ubuntu/ xenial universe
deb http://archive.ubuntu.com/ubuntu bionic-updates universe
# deb-src http://fr.archive.ubuntu.com/ubuntu/ xenial-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://archive.ubuntu.com/ubuntu bionic multiverse
# deb-src http://fr.archive.ubuntu.com/ubuntu/ xenial multiverse
deb http://archive.ubuntu.com/ubuntu bionic-updates multiverse
# deb-src http://fr.archive.ubuntu.com/ubuntu/ xenial-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-src http://fr.archive.ubuntu.com/ubuntu/ xenial-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://archive.ubuntu.com/ubuntu bionic-security main restricted
# deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted
deb http://archive.ubuntu.com/ubuntu bionic-security universe
# deb-src http://security.ubuntu.com/ubuntu xenial-security universe
deb http://archive.ubuntu.com/ubuntu bionic-security multiverse
# deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse
deb https://dl.winehq.org/wine-builds/ubuntu/ bionic main
# deb-src https://dl.winehq.org/wine-builds/ubuntu/ bionic main
ls /etc/apt/sources.list.d -1
megasync.list
megasync.list.distUpgrade
megasync.list.save
slack.list
slack.list.save
teamviewer.list
答案1
您需要设置适当的代理设置： https://help.ubuntu.com/community/Ap...e_a_http-proxy
注意使用命令
代码：
sudo -H gedit
而不是 gksudo，因为 gksudo 不再存在。
编辑：由于链接不存在，请尝试此操作
Apt 将所有配置文件加载到 /etc/apt/apt.conf.d 下。我们可以在那里为我们的代理专门创建一个配置，并将其与所有其他配置分开。
创建一个名为proxy.conf的新配置文件。
sudo touch /etc/apt/apt.conf.d/proxy.conf
在文本编辑器中打开 proxy.conf 文件。
sudo vi /etc/apt/apt.conf.d/proxy.conf
添加以下行来设置您的 HTTP 代理。
Acquire::http::Proxy "http://user:[email protected]:port/";
添加以下行来设置您的 HTTPS 代理。
Acquire::https::Proxy "http://user:[email protected]:port/";
保存更改并退出文本编辑器。
您的代理设置将在您下次运行 Apt 时应用。