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

[Brian Murray]

I tried this both with an Ubuntu desktop install of 18.04 LTS and an lxc
cloud image of 18.04 LTS and during neither upgrade process did I
encounter the error described in this bug report. Here's some relevant
information from the lxc upgrade.

ubuntu at gorgeous-molly:~$ tail /var/log/dist-upgrade/screenlog.0

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

Continue [yN] y
W: molly-guard: SSH session detected!
Please type in hostname of the machine to reboot:
Good thing I asked; I won't reboot gorgeous-molly ...

=== Command detached from window (Tue Aug  4 03:29:45 2020) ===

ubuntu at gorgeous-molly:~$ cat /etc/apt/sources.list
## Note, this file is written by cloud-init on first boot of an instance
## modifications made here will not survive a re-bundle.
## if you wish to make changes you can:
## a.) add 'apt_preserve_sources_list: true' to /etc/cloud/cloud.cfg
##     or do the same in user-data
## b.) add sources in /etc/apt/sources.list.d
## c.) make changes to template file /etc/cloud/templates/sources.list.tmpl

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://192.168.10.7/ubuntu focal main restricted
# deb-src http://192.168.10.7/ubuntu bionic main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://192.168.10.7/ubuntu focal-updates main restricted
# deb-src http://192.168.10.7/ubuntu bionic-updates main restricted
...

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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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