I am also getting this with 18.04.5 LTS.  In /etc/apt/apt.conf.d/99proxy
I have:

Acquire::http::Proxy "http://127.0.0.1:3142/";;
Acquire::https::Proxy "DIRECT";

and sometimes the the motd displays

proxy 'DIRECT' looks invalid

I have discovered why it's intermittent: that text is the *stderr*
output from /usr/lib/ubuntu-release-upgrader/check-new-release -q

This means it doesn't get stored in /var/lib/ubuntu-release-upgrader
/release-upgrade-available, because only the *stdout* is redirected
there.

Therefore, it only gets displayed at login time when /usr/lib/ubuntu-
release-upgrader/release-upgrade-motd is run, and this only performs the
check if its previous output is more than 1 day old.

I also note that the script runs "check-new-release -q" in the
background (with &), which means that its stderr output could in
principle appear later on and be mixed up with other output. Perhaps
this is intentional, so that messages like "Failed to connect to
https://changelogs.ubuntu.com/meta-release-lts. Check your Internet
connection or proxy settings" don't persist in the motd.

But in any case, "DIRECT" is a documented and valid form for proxy, so
it should not generate any warning.

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

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

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