Public bug reported:

On login, occasionally I see:

proxy 'http://[<ipv6 address redacted>]:3128/' looks invalid

I tracked this down to /etc/update-motd.d/91-release-upgrade which is
calling "/usr/lib/ubuntu-release-upgrader/check-new-release -q" when a
cache is stale, and I can reproduce this every time by running "sudo
usr/lib/ubuntu-release-upgrader/check-new-release -q".

It looks like UpdateManager/Core/utils.py has an incomplete regexp
"http://\w+";, which does not catch the square brackets used around an
IPv6 address. Presumably the regexp needs extending. In my case I'm
specifying my proxy by IP because I use Zeroconf names (using mdns) but
in this case am using it inside a container that is bridged so .local
names do not resolve there.

This presumably means that it ignores my proxy definition too, though I
haven't tested this.

This is with update-manager-core 1:16.04.3 but it looks like the source
from 1:16.10.1 is still affected.

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

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https://bugs.launchpad.net/bugs/1587204

Title:
  Spams motd with "proxy ... looks invalid"

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