In my warning post I tried to get users of 18.04 to use ubuntu-support-status to view their package status, which would have shown them only packages from the ‘main’ repository get 5 years of supported life, and its only these that get ESM support (and going by historical precedent of precise or trusty, it may not even be all of these the full term, or coverage may only be via HWE, however you will be given warning). ESM also only covers
“the Ubuntu base OS and scale-out infrastructure”
With both the Canonical 3 year support & Community 3 year support packages now EOL for my 18.04 example box , the ubuntu-support-status example is now a lot simpler to read
guiverc@t43-lubu:~$ ubuntu-support-status
Support status summary of 't43-lubu':
You have 1332 packages (70.8%) supported until April 2023 (Canonical - 5y)
You have 0 packages (0.0%) that can not/no-longer be downloaded
You have 549 packages (29.2%) that are unsupported
Run with --show-unsupported, --show-supported or --show-all to see more details
guiverc@t43-lubu:~$
If you contrast the 29.2% now unsupported with what it was before Lubuntu 18.04 LTS reached EOL (10.9%) for my box, you’ll note it’s grown significantly. You aren’t receiving all security updates, only those relating to supported packages.
Addendum: I just noticed my pre-EOL example was a different box so my comparison isn’t perfect… Whilst I can re-do the t43; I can’t re-do the 755 as it’s now running Lubuntu 20.04 LTS