[Bug 1748540] Re: do-release-upgrade breaks if /etc/apt/preferences.d has a rule against a release

[Launchpad Bug Tracker]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no
activity for 60 days.]

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1748540

Title:
  do-release-upgrade breaks if /etc/apt/preferences.d has a rule against
  a release

Status in ubuntu-release-upgrader package in Ubuntu:
  Expired

Bug description:
  The system was Ubuntu Xenial (16.04.3) LTS.

  I occasionally try to install a newer version of OpenSSH by using
  three files (note that in previous incarnations they had "zenity"
  instead of "artful", the idea is "a slightly newer release of the
  platform I'm using for a specific set of packages -- but don't upgrade
  the farm"):

  /etc/apt/preferences.d/01-artful:
  Package: *
  Pin: release n=artful
  Pin-Priority: -10

  /etc/apt/preferences.d/02-artful-ssh:
  Package: openssh-client
  Pin: release n=artful
  Pin-Priority: 600

  Package: libgssapi-krb5-2
  Pin: release n=artful
  Pin-Priority: 600

  Package: libkrb5-3
  Pin: release n=artful
  Pin-Priority: 600

  Package: libkrb5support0
  Pin: release n=artful
  Pin-Priority: 600

  Package: libk5crypto3
  Pin: release n=artful
  Pin-Priority: 600

  Package: openssh-server
  Pin: release n=artful
  Pin-Priority: 600

  Package: openssh-sftp-server
  Pin: release n=artful
  Pin-Priority: 600

  /etc/apt/sources.list.d/artful.list:
  deb http://ca.archive.ubuntu.com/ubuntu/ artful main restricted
  deb-src http://ca.archive.ubuntu.com/ubuntu/ artful main restricted

  ## Major bug fix updates produced after the final release of the
  ## distribution.
  deb http://ca.archive.ubuntu.com/ubuntu/ artful-updates main restricted
  deb-src http://ca.archive.ubuntu.com/ubuntu/ artful-updates main restricted
  root at mail-ca:~# cat /etc/apt/sources.list.d/artful.list.distUpgrade
  deb http://ca.archive.ubuntu.com/ubuntu/ artful main restricted
  deb-src http://ca.archive.ubuntu.com/ubuntu/ artful main restricted

  ## Major bug fix updates produced after the final release of the
  ## distribution.
  deb http://ca.archive.ubuntu.com/ubuntu/ artful-updates main restricted
  deb-src http://ca.archive.ubuntu.com/ubuntu/ artful-updates main restricted

  
  ----
  This didn't work for OpenSSH as the artful version requires a newer version of libc6. So, I decided to do a release upgrade (but left the files in place...)
  ----
  I set `Prompt=normal` in `/etc/update-manager/release-upgrades` and ran
  do-release-upgrade

  It eventually gave me:
  ```
  The software on this computer is up to date.

  There are no upgrades available for your system. The upgrade will now
  be canceled.

  
  Do you want to start the upgrade?


   Continue [yN]  Details [d]

  ```

  Which was very confusing... Along this path, it even encouraged me to
  reboot my computer (which I did).

  Nothing was harmed, but nothing particularly useful was achieved either.
  ----

  Expected results:
  When do-release-upgrade performs an update, it has enough knowledge to ignore the files in /etc/apt/sources.list.d/ because it understands they're likely to conflict with the release upgrade process. It should either do the same form /etc/apt/preferences.d/ or warn to the user in case it runs into a circumstance like mine.

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