[Bug 2015420] [NEW] motd: esm and normal update messages are intertwined

[Grant Orndorff]

Public bug reported:

See https://github.com/canonical/ubuntu-pro-client/issues/2458 for the
origin of the conversation.

We don't think it needs to be _easy_, but it should probably be less
burdensome to disable ESM update notifications in MOTD without disabling
all update notifications in MOTD.

One idea to accomplish this is to separate the /etc/update-motd.d/ files
into two. One would print the normal update message, and the other would
print the ESM message. Then, if an admin knows what they're doing and is
willing to accept the risk, they can remove or edit the ESM update-
notifier motd conffile. This is similar to how you can remove the APT
ESM messages by removing/editing /etc/apt/apt.conf.d/20apt-esm-hook.conf
if you know what you're doing.

This would also require some changes to how the messages are created,
since currently it is all in apt_check.py and printed into a single
message file. They'll need to be separated somehow.

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

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https://bugs.launchpad.net/bugs/2015420

Title:
  motd: esm and normal update messages are intertwined

Status in update-notifier package in Ubuntu:
  New

Bug description:
  See https://github.com/canonical/ubuntu-pro-client/issues/2458 for the
  origin of the conversation.

  We don't think it needs to be _easy_, but it should probably be less
  burdensome to disable ESM update notifications in MOTD without
  disabling all update notifications in MOTD.

  One idea to accomplish this is to separate the /etc/update-motd.d/
  files into two. One would print the normal update message, and the
  other would print the ESM message. Then, if an admin knows what
  they're doing and is willing to accept the risk, they can remove or
  edit the ESM update-notifier motd conffile. This is similar to how you
  can remove the APT ESM messages by removing/editing
  /etc/apt/apt.conf.d/20apt-esm-hook.conf if you know what you're doing.

  This would also require some changes to how the messages are created,
  since currently it is all in apt_check.py and printed into a single
  message file. They'll need to be separated somehow.

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