I have a number of servers running Ubuntu 18.04, all of which stopped updating anything on Dec 17. No errors seen in the unattended-upgrades or unattended-upgrades-dpkg log files.
If I do apt-get update I see some stuff download, but if I do apt-get upgrade nothing upgrades. This is despite running old kernels that have had recent vulnerabilties for which there are upgrades.
Anyone know the best way to troubleshoot why this is (or isn't!) happening?
Mirror in use is archive.ubuntu.com
Nothing is wrong with your systems, at least that is causing this.
Updates have resumed as of 1/4/21. If you do not receive any updates in the next day or so, please report back.
There haven't been any updates since then to the 18.04 repositories. I suspect they're taking the last two weeks of the year off. I got a google-chrome-unstable update on the 18th, but that is from a PPA.
The "stuff downloaded" is the index files that your systems use to determine if there have been updates or not.
Source: Ubuntu Updates
if I do apt-get upgrade nothing upgrades.
This is the wrong command.
Do 'apt full-upgrade' and then reboot all of the affected servers. I additionally recommend 'apt clean' afterwards to empty the package cache, 'apt autoremove' to get rid of any obsoleted packages, and 'apt purge' to remove any lingering configurations.
