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我想在我的 debian 9 (stretch) 机器上安装 git，当我输入：
sudo apt install git-all
我收到这条消息：
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 followi`ng information may help to resolve the situation:
The following packages have unmet dependencies:
git-all : Depends: git (> 1:2.25.0) but it is not going to be installed
Depends: git (< 1:2.25.0-.) but it is not going to be installed
Depends: git-el but it is not going to be installed
Depends: git-cvs but it is not going to be installed
Depends: git-mediawiki but it is not going to be installed
Depends: git-svn but it is not going to be installed
Depends: git-email but it is not going to be installed
Depends: git-gui but it is not going to be installed
Depends: gitk but it is not going to be installed
Depends: gitweb but it is not going to be installed
Recommends: git-daemon-run but it is not going to be installed or
git-daemon-sysvinit but it is not going to be installed
E: Unable to correct problems, you have held broken packages
任何帮助，提前致谢
编辑
当我输入时什么也没有发生：
sudo dpkg --configure -a
该命令的结果：
sudo apt update && sudo apt upgrade
这是一条消息：
Hit:1 http://security.debian.org stretch/updates InRelease
Ign:2 http://deb.debian.org/debian stretch InRelease
Ign:3 http://httpredir.debian.org/debian stretch InRelease
Hit:4 http://ppa.launchpad.net/git-core/ppa/ubuntu focal InRelease
Hit:5 http://deb.debian.org/debian stretch-updates InRelease
Ign:6 http://repo.mongodb.org/apt/debian stretch/mongodb-org/4.0 InRelease
Hit:7 http://httpredir.debian.org/debian stretch Release
Hit:8 http://repository.spotify.com stable InRelease
Hit:9 http://deb.debian.org/debian stretch Release
Hit:12 http://repo.mongodb.org/apt/debian stretch/mongodb-org/4.0 Release
Hit:13 http://ppa.launchpad.net/webupd8team/java/ubuntu xenial InRelease
Hit:16 http://ppa.launchpad.net/webupd8team/java/ubuntu bionic InRelease
Get:17 https://dl.yarnpkg.com/debian stable InRelease [17.1 kB]
Get:18 https://deb.nodesource.com/node_9.x stretch InRelease [4,623 B]
Hit:19 http://ppa.launchpad.net/webupd8team/java/ubuntu cosmic InRelease
Hit:20 https://repo.skype.com/deb stable InRelease
Ign:10 https://get.docker.com/ubuntu docker InRelease
Get:21 https://get.docker.com/ubuntu docker Release [1,525 B]
Get:22 https://get.docker.com/ubuntu docker Release.gpg [473 B]
Ign:22 https://get.docker.com/ubuntu docker Release.gpg
Reading package lists... Done
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/base.list:1
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/base.list:1
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/base.list:1
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/base.list:1
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/base.list:1
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/base.list:1
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/base.list:1
W: GPG error: https://get.docker.com/ubuntu docker Release: The following signatures were invalid: 36A1D7869245C8950F966E92D8576A8BA88D21E9
E: The repository 'http://get.docker.io/ubuntu docker Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/base.list:1
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/base.list:1
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/base.list:1
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/base.list:1
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/base.list:1
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/base.list:1
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:18 and /etc/apt/sources.list.d/base.list:1
答案1
问题是这样的：
http://ppa.launchpad.net/git-core/ppa/ubuntu focal
您无法在 Debian 9 上使用 Ubuntu 焦点 PPA。从您的配置中删除它，您将能够安装 git。
你可能也不需要git-all，
sudo apt install git
应该足够了。