[Bug 1888916] Re: after the upgrade completes reattaching to the screen session can restore your sources.list file

[Brian Murray]

Actually, just choosing to resurrect the screen window will restart the
upgrade process which then will warn you about an upgrade not succeeding
and then if you exit that sources.list.distUpgrade will be restored.

I tried messing with screenrc and adding "onerror" to zombie
(https://www.gnu.org/software/screen/manual/html_node/Zombie.html) but
that did not help.

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

Title:
  after the upgrade completes reattaching to the screen session can
  restore your sources.list file

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

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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