[Bug 1587204] Re: Spams motd with "proxy ... looks invalid"

[Jane Atkinson]

Still happening in Ubuntu server 20.04.1.

I have

Acquire::https::Proxy "DIRECT";

set in apt.conf and I'm getting the message "Proxy 'DIRECT' looks
invalid" on logging in.

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

Status in update-manager package in Ubuntu:
  Confirmed

Bug description:
  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.

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