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

[Brian Murray]

Come to find out that adding "onerror" to zombie in the screenrc file
does help there is just what is approximately a 10 second delay between
the "Command detached from window" message and the upgrade process
exiting 0 which then causes screen to disappear.

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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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