[Bug 1842159] [NEW] Please suggest running apt update & apt upgrade in MOTD, list of available packages is old

[Balint Reczey]

Public bug reported:

When logging into a system where the package list is not updated for
long time (for example because is offline) I may see:

...
0 updates can be installed immediately.
0 of these updates are security updates.
..

Which is true, but the user may think that there are no available
updates released.

Also, if the /var/lib/update-notifier/updates-available is missing
(which can happen due to network connectivity issues of due to bugs)
there is no mention of updates in MOTD.

If the  /var/lib/update-notifier/updates-available is older than a few
days (weeks?) or it is missing and the packages list is older than a few
days (weeks?) please recommend running apt update & upgrade in the MOTD
snippet:

...
The list of available updates is not refreshed in N days.
Please run "sudo apt update" and then "sudo apt upgrade" to 
keep your system up to date.
...

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

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https://bugs.launchpad.net/bugs/1842159

Title:
  Please suggest running apt update & apt upgrade in MOTD,  list of
  available packages is old

Status in update-notifier package in Ubuntu:
  New

Bug description:
  When logging into a system where the package list is not updated for
  long time (for example because is offline) I may see:

  ...
  0 updates can be installed immediately.
  0 of these updates are security updates.
  ..

  Which is true, but the user may think that there are no available
  updates released.

  Also, if the /var/lib/update-notifier/updates-available is missing
  (which can happen due to network connectivity issues of due to bugs)
  there is no mention of updates in MOTD.

  If the  /var/lib/update-notifier/updates-available is older than a few
  days (weeks?) or it is missing and the packages list is older than a
  few days (weeks?) please recommend running apt update & upgrade in the
  MOTD snippet:

  ...
  The list of available updates is not refreshed in N days.
  Please run "sudo apt update" and then "sudo apt upgrade" to 
  keep your system up to date.
  ...

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