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[Launchpad Bug Tracker <1932028@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package ubuntu-advantage-tools -
27.2.1~20.04.1

---------------
ubuntu-advantage-tools (27.2.1~20.04.1) focal; urgency=medium

  * Backport new upstream release: (LP: #1934902) to focal

 -- Chad Smith <chad.smith@xxxxxxxxxxxxx>  Fri, 16 Jul 2021 12:48:51
-0600

** Changed in: ubuntu-advantage-tools (Ubuntu Bionic)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1932028

Title:
  missing version dependency on distro-info

Status in ubuntu-advantage-tools package in Ubuntu:
  Fix Released
Status in ubuntu-advantage-tools source package in Xenial:
  Fix Released
Status in ubuntu-advantage-tools source package in Bionic:
  Fix Released
Status in ubuntu-advantage-tools source package in Focal:
  Fix Released
Status in ubuntu-advantage-tools source package in Hirsute:
  Fix Released

Bug description:
  [Impact]

  If a user on xenial or on bionic has an old version of distro-info and
  then upgraded ubuntu-advantage-tools, they will get periodic
  tracebacks from our update_messaging systemd unit, and enabling
  services with ua will always fail.

  The fix is to specify the required versions of distro-info that
  ubuntu-advantage-tools needs to function.

  Backporting this fix is necessary to ensure xenial and bionic users
  who happen to have an older version of distro-info are able to enable
  ubuntu-advantage services without first finding this bug, then
  manually upgrading distro-info.

  [Test Plan]

  This should be tested on both xenial and bionic. These test steps
  assume that the proposed version of ua to release is available in
  ppa:ua-client/staging - check with the ubuntu-advantage-tools team
  before proceeding to make sure this is the case.

  First reproduce the issue.

  In a xenial container:
  ```
  sudo apt install distro-info=0.14build1 distro-info-data=0.28
  sudo apt install ubuntu-advantage-tools
  sudo python3 /usr/lib/ubuntu-advantage/ua_update_messaging.py
  # expect a traceback
  sudo ua attach YOUR_TOKEN
  # expect error messages
  sudo ua detach
  # expect error messages
  ```

  In a bionic container:
  ```
  sudo apt install distro-info=0.18 distro-info-data=0.37
  sudo apt install ubuntu-advantage-tools
  sudo python3 /usr/lib/ubuntu-advantage/ua_update_messaging.py
  # expect a traceback
  sudo ua attach YOUR_TOKEN
  # expect error messages
  sudo ua detach
  # expect error messages
  ```

  To see the fix in action, on both xenial and bionic:
  ```
  sudo add-apt-repository ppa:ua-client/staging
  sudo apt-get update
  sudo apt install ubuntu-advantage-tools
  sudo python3 /usr/lib/ubuntu-advantage/ua_update_messaging.py
  # there should be no traceback or error
  sudo ua attach YOUR_TOKEN
  # expect success and no error messages
  sudo ua detach
  # expect success and no error messages
  ```

  [Where problems could occur]

  In order to require the correct versions for both xenial and bionic
  and later releases, the Depends line is somewhat complex. The same
  line is required under Build-Depends as well. So if there is a
  mistake, such as if the version constraints incorrectly include a
  version they shouldn't, then this could cause errors during build as
  well as during install.

  [Other Info]

  The complexity in the depends line is because of the following
  versions of distro-info. This list includes which release they are one
  and which ones will work as our dependency:

  - xenial: 0.14build1           doesn't work
  - xenial: 0.14ubuntu0.2        works
  - bionic: 0.18                 doesn't work
  - bionic: 0.18ubuntu0.18.04.1  works

  focal and later have higher version numbers than 0.18

  So to grab the correct version across all versions, we need to set a
  minumum version of 0.18ubuntu0.18.04.1 OR get exactly 0.14ubuntu0.2,
  but nothing in between.

  [Original Description]

  27.0~16.04.1 on Xenial.  ubuntu-advantage-tools was upgraded, the rest
  of the machine is painfully behind.

  Resulted in this:

  Jun 15 13:34:46 MAAS systemd[1]: Starting Ubuntu Advantage APT and MOTD Messages...
  Jun 15 13:34:46 MAAS python3[15434]: Traceback (most recent call last):
  Jun 15 13:34:46 MAAS python3[15434]:   File "/usr/lib/ubuntu-advantage/ua_update_messaging.py", line 302, in <module>
  Jun 15 13:34:46 MAAS python3[15434]:     update_apt_and_motd_messages(cfg=cfg)
  Jun 15 13:34:46 MAAS python3[15434]:   File "/usr/lib/ubuntu-advantage/ua_update_messaging.py", line 284, in update_apt_and_motd_messages
  Jun 15 13:34:46 MAAS python3[15434]:     if not util.is_lts(series):
  Jun 15 13:34:46 MAAS python3[15434]:   File "/usr/lib/python3/dist-packages/uaclient/util.py", line 353, in is_lts
  Jun 15 13:34:46 MAAS python3[15434]:     out, _err = subp(["/usr/bin/ubuntu-distro-info", "--supported-esm"])
  Jun 15 13:34:46 MAAS python3[15434]:   File "/usr/lib/python3/dist-packages/uaclient/util.py", line 608, in subp
  Jun 15 13:34:46 MAAS python3[15434]:     out, err = _subp(args, rcs, capture, timeout, env=env)
  Jun 15 13:34:46 MAAS python3[15434]:   File "/usr/lib/python3/dist-packages/uaclient/util.py", line 565, in _subp
  Jun 15 13:34:46 MAAS python3[15434]:     stderr=err.decode("utf-8"),
  Jun 15 13:34:46 MAAS python3[15434]: uaclient.util.ProcessExecutionError: Failed running command '/usr/bin/ubuntu-distro-info --supported-esm' [exit(1)]. Message: ubuntu-distro-info: unrecognized option `--supported-esm'
  Jun 15 13:34:46 MAAS systemd[1]: ua-messaging.service: Main process exited, code=exited, status=1/FAILURE
  Jun 15 13:34:46 MAAS systemd[1]: Failed to start Ubuntu Advantage APT and MOTD Messages.
  Jun 15 13:34:46 MAAS systemd[1]: ua-messaging.service: Unit entered failed state.
  Jun 15 13:34:46 MAAS systemd[1]: ua-messaging.service: Failed with result 'exit-code'.

  Installed distro-info was 0.14build1 ; upgrading to current fixed it.

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