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Ubuntu 无法启动，有什么建议吗？

tag-icon • tag-icon boot dependencies postfix 21.04 error-handling
Ubuntu 无法启动，有什么建议吗？

以下是我在启动计算机时收到的消息：

/dev/sda2:clean, 567436/30049216 files, 10011641/12112000 blocks
[FAILED] FAILED to start Light Display  Manager
[   39.002848] overlayfs: missing 'lowerdir'                    
[FAILED] FAILED to start Light Display Manager
[FAILED] FAILED to start Light Display Manager
[FAILED] FAILED to start Light Display Manager
[FAILED] FAILED to start Light Display Manager 
[FAILED] FAILED to start Light Display Manager
[DEPEND] Dependency failed for SSSD NSS Service responder socket

[DEPEND] Dependency failed for SSSD Auto FS Service responder socket

[DEPEND] Dependency failed for SSSD PAC Service responder  socket.

[DEPEND] Dependency  failed for SSSD PAM Service  responder socket 

[DEPEND] Dependency  failed for SSSD PAM Service responder socket

[DEPEND] Dependency  failed for SSSD SSH Service responder  socket 

[DEPEND] Dependency  failed for SSSD Sudo Service  responder socket

[FAILED] Failed to start Postfix Mail Transport Agent (instance -)
[DEPEND]

我在尝试重新安装终端在升级到 21.04 期间删除的系统软件包后收到错误，但我注意到它删除的是新软件包，所以我中途终止了该过程。我正在重新安装它删除的文件，然后出现了这个错误。现在我要说的是，我所做的可能不是最明智的事情。只是抛出这个错误。我仍然能够访问控制台，尽管我很难记住我的 Linux ID 来访问它。我主要在寻找如何解决这些错误，但如果你们能够提供登录问题的解决方案，我也会很感激。谢谢

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