[Bug 2143786] Re: release-upgrade-motd leaks stderr to terminal

[Ubuntu Foundations Team Bug Bot]

The attachment "Fix: redirect stderr to /dev/null for background check-
new-release calls" seems to be a patch.  If it isn't, please remove the
"patch" flag from the attachment, remove the "patch" tag, and if you are
a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by
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https://bugs.launchpad.net/bugs/2143786

Title:
  release-upgrade-motd leaks stderr to terminal

Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed

Bug description:
  In /usr/lib/ubuntu-release-upgrader/release-upgrade-motd, the background
  check-new-release process is started without redirecting stderr:

      /usr/lib/ubuntu-release-upgrader/check-new-release -q > "$stamp" &

  When check-new-release fails to connect, the error appears in the
  terminal:

      Failed to connect to https://changelogs.ubuntu.com/meta-release-lts.
      Check your Internet connection or proxy settings

  This is unexpected — the process runs in the background (&) and uses
  the -q (quiet) flag, so no output should be visible to the user.

  Fix: redirect stderr to /dev/null for both occurrences:

      /usr/lib/ubuntu-release-upgrader/check-new-release -q > "$stamp"
  2>/dev/null &

  Package version: ubuntu-release-upgrader-core 1:24.04.28
  Ubuntu version: 24.04.4 LTS (Noble)

  Patch attached.

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