[Bug 1707290] [NEW] Removing package leaves motd script in place, renders incorrect motd

[Andreas Hasenack]

Public bug reported:

Removing the ubuntu-advantage-tools package (not purging: removing) will
leave the /etc/update-motd.d/99-esm script in place. Accordingly, it
will run at login time, but since it calls out to the ubuntu-advantage
script that no longer exists, it fails.

This is the sequence of events:
- ubuntu-advantage-tools is installed
- sudo ubuntu-advantage enable-esm with a valid token is run
- logout and login, confirming that the MOTD says something like "This Ubuntu 12.04 system is configured to receive extended security updates"
- remove (not purge) the ubuntu-advantage package. This will leave the sources.list.d/ file with the ESM repository in place and working, but remove the ubuntu-advantage script
- logout and login. The MOTD will now say "This Ubuntu 12.04 LTS system is past its End of Life", even though the ESM repository is still enabled and functioning.

** Affects: ubuntu-advantage-script
     Importance: Unknown
         Status: Unknown

** Affects: ubuntu-advantage-tools (Ubuntu)
     Importance: Low
         Status: New

** Bug watch added: github.com/CanonicalLtd/ubuntu-advantage-script/issues #28
   https://github.com/CanonicalLtd/ubuntu-advantage-script/issues/28

** Also affects: ubuntu-advantage-script via
   https://github.com/CanonicalLtd/ubuntu-advantage-script/issues/28
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1707290

Title:
  Removing package leaves motd script in place, renders incorrect motd

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