[Bug 1888916] Re: upgrade from bionic to focal a server with molly-guard moves back sources.list to bionic entries

[Brian Murray]

I tried recreating this and while the system did not reboot sources.list
was not restored to bionic.

bdmurray at clean-bionic-amd64:~$ tail /var/log/dist-upgrade/screenlog.0
System upgrade is complete.

Restart required

To finish the upgrade, a restart is required.
If you select 'y' the system will be restarted.

Continue [yN] y

=== Command terminated normally (Mon Aug  3 18:44:27 2020) ===
bdmurray at clean-bionic-amd64:~$ cat /etc/apt/sources.list
deb http://192.168.10.7/ubuntu focal main restricted universe multiverse
deb http://192.168.10.7/ubuntu focal-updates main restricted universe multiverse
# deb http://archive.ubuntu.com/ubuntu bionic-proposed main restricted universe multiverse
deb http://192.168.10.7/ubuntu focal-security main restricted universe multiverse
deb-src http://192.168.10.7/ubuntu focal main restricted universe multiverse
deb-src http://192.168.10.7/ubuntu focal-updates main restricted universe multiverse
# deb-src http://archive.ubuntu.com/ubuntu bionic-proposed main restricted universe multiverse
deb-src http://192.168.10.7/ubuntu focal-security main restricted universe multiverse
bdmurray at clean-bionic-amd64:~$ ls -lh /sbin/reboot
lrwxrwxrwx 1 root root 28 Jul  9  2019 /sbin/reboot -> /lib/molly-guard/molly-guard

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https://bugs.launchpad.net/bugs/1888916

Title:
  upgrade from bionic to focal a server with molly-guard moves back
  sources.list to bionic entries

Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged
Status in ubuntu-release-upgrader source package in Groovy:
  Triaged

Bug description:
  I've upgraded a server via `do-release-upgrade` from Ubuntu Bionic to
  Focal, with molly-guard installed on it - molly-guard configured to
  always ask for the hostname.

  After it has finished:

  ```
  System upgrade is complete.

  Restart required

  To finish the upgrade, a restart is required. 
  If you select 'y' the system will be restarted. 

  Continue [yN] y
  I: molly-guard: reboot is always molly-guarded on this system.
  Please type in hostname of the machine to reboot: 
  Good thing I asked; I won't reboot bates ...

  
  === Command detached from window (Tue Jul 21 15:23:36 2020) ===

  === Command terminated normally (Tue Jul 21 15:23:46 2020) ===
  ```

  It doesn't alert you it was restoring original state of sources.list. 
  After rebooting the system and it came back up showing `Welcome to Ubuntu 20.04 LTS`, I've just noticed it was pointing out to bionic instead of focal installing a package.

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