Canonical has resolved its service issues, and measured error levels have returned to normal levels. Further details are captured here: https://status.canonical.com/#/incident/KNms6QK9ewuzz-7xUsPsNylV20jEt5kyKsd8A-3ptQGnu9-UhZcQUtDmIVRYTQMx6Vt0EjSxe6Bz4_D89gPRLg==

Canonical (Ubuntu)'s package mirrors are degraded. Users may encounter timeouts or other connection related issues when running apt-get commands.

We are monitoring the situation and will provide ongoing updates if the situation changes. See https://status.canonical.com/ for further detail.