我试图编译一个 hello world c 文件。我尝试 apt-get install build_essentials，但它说由于 g++ 无法安装，可能是 g++6。然后我告诉它安装 g++6，但它却抱怨其他东西。最后它说必须降级某些东西才能安装，我说继续。我想可能是 libc。我试过了，但重启电脑后，kde 登录屏幕不熟悉，无法工作。它是蓝色的，我仍然可以将桌面切换到控制台并登录。
我相信 Ubuntu 版本是 Ubuntu 20.04.3 LTS。（或者至少在命令之前是哈哈）
建议采取哪些措施来让系统恢复运行。如果 gcc 无法工作，也没关系。我还有其他电脑。有没有一组简单的 apt-get 命令可以删除我设置的愚蠢降级，并让一切恢复原状？我可以确认这一点和其他事情。
登录屏幕如下所示：
登录屏幕如下所示：
我找到了 apt-get 日志文件。看起来第一个被卸载的是 kubuntu-desktop，所以再次安装它可能是解决问题的办法。
Log started: 2021-12-25 09:00:35
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update-alternatives: using /etc/newt/palette.ubuntu to provide /etc/newt/palette (newt-palette) in auto mode
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Log ended: 2021-12-25 09:00:37
Log started: 2021-12-25 09:00:50
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Log ended: 2021-12-25 09:00:50
Log started: 2021-12-25 09:03:30
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[1mdpkg:[0m [1;33mwarning:[0m while removing libgcc-s1:i386, directory '/lib/i386-linux-gnu' not empty so not removed
[1mdpkg:[0m [1;33mwarning:[0m downgrading libc6:amd64 from 2.31-0ubuntu9.3 to 2.31-0ubuntu9.2
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Log ended: 2021-12-25 09:03:56
答案1
sudo apt-get install kubuntu-desktop
可以修复桌面。kubuntu-desktop是 KDE 的元包。
这是以前的经验。通常，两个问题可能会导致登录屏幕出现此类结果。
由于软件包之间存在冲突，默认显示管理器 DM 已被删除或被新安装的 DM 替换（未满足的依赖关系安装了某些基础库或新的桌面环境 DE。
或者是 DM 本身或其设置的问题。
顺便说一句，这是第一种情况，我建议aptitude在有未满足的依赖关系时尝试并翻转提供的解决方案，而不是全部降级或删除许多软件包。