[Bug 1867423] Re: Update to glibc 2.31-0ubuntu5 breaks system

[Evgen]

I managed to restore system (of course it's a temporary solution until
libc6 package is fixed)

- boot from any debian-based live image or from parallel system
- gain access to disk with broken system
- sudo mount /dev/sda2 /mnt (where sda2 is a partition of your broken system)
- wget http://launchpadlibrarian.net/453587373/libc6_2.30-0ubuntu3_amd64.deb
- dpkg -x libc6_2.30-0ubuntu3_amd64.deb ~/libc6-previous
- sudo cp ~/libc6-previous/lib/x86_64-linux-gnu/libcrypt-2.30.so /mnt/lib/x86_64-linux-gnu/
- cd /mnt/lib/x86_64-linux-gnu/
- sudo ln -s libcrypt-2.30.so libcrypt.so.1

Now you can at least boot your system.

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https://bugs.launchpad.net/bugs/1867423

Title:
  Update to glibc 2.31-0ubuntu5 breaks system

Status in glibc package in Ubuntu:
  Confirmed

Bug description:
  After upgrade to this version I'm unable to login into system. Right after update
  - I can't do anything with sudo. System immediately says that password is incorrect
  $ sudo .
  Sorry, try again.
  Sorry, try again.
  sudo: 3 incorrect password attempts
  - GUI apps which require admin rights (synaptic) also stopped working
  - After reboot SDDM can't reach login screen
  - if you try recovery mode with root parameter system complains
  /sbin/sulogin: error while loading shared libraries: libcrypt.so.1: cannot open shared object file: No such file or directory

  So after this update file
  /usr/lib/x86_64-linux-gnu/libcrypt.so.1
  got deleted.

  On Kubuntu 20.04, which was last upgraded yesterday, upgrade stopped
  with some error about unfinished configuration of libcrypt1. On Ubuntu
  20.04 (GNOME) which was last upgraded at Feb 16, upgrade went well but
  system also got broken.

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