[Bug 1926819] [NEW] Empty MOTD on update-to-date focal systems (includes fix)

[Aaron Thompson]

Public bug reported:

Starting with update-notifier-common 3.192.30.7 (focal), my up-to-date
systems are showing this MOTD on login:

Welcome to Ubuntu 20.04.2 LTS (GNU/Linux 5.4.0-72-generic x86_64)


user at host:~$


I've attached a patch that fixes this issue and adds more test cases.

** Affects: update-notifier (Ubuntu)
     Importance: Undecided
         Status: New

** Patch added: "0001-apt_check.py-Fix-empty-output-in-the-no-ESM-up-to-da.patch"
   https://bugs.launchpad.net/bugs/1926819/+attachment/5493997/+files/0001-apt_check.py-Fix-empty-output-in-the-no-ESM-up-to-da.patch

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https://bugs.launchpad.net/bugs/1926819

Title:
  Empty MOTD on update-to-date focal systems (includes fix)

Status in update-notifier package in Ubuntu:
  New

Bug description:
  Starting with update-notifier-common 3.192.30.7 (focal), my up-to-date
  systems are showing this MOTD on login:

  Welcome to Ubuntu 20.04.2 LTS (GNU/Linux 5.4.0-72-generic x86_64)


  user at host:~$

  
  I've attached a patch that fixes this issue and adds more test cases.

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