Since many years I had Lubuntu 18.04.6 and I found it the best operating system for my needs.
Now I don’t find it anymore to download. Why 18.04.6 is not available to download? I only find 18.04.5. What is the difference between the two? Shall I go with 18.04.5 instead of 18.04.6?
There was no flavor release of Ubuntu 18.04.6 LTS; never was.
Lubuntu like all flavors of Ubuntu Desktop came with three years of support; which ended 28 April 2021 as per our notice - https://lubuntu.me/bionic-eol/
Unlike previous point releases, 18.04.6 is a refresh of the amd64 and arm64 installer media after the key revocation related to the BootHole vulnerability, re-enabling their usage on Secure Boot enabled systems. More detailed information can be found here:
Maintenance updates will be provided for 5 years for Ubuntu Desktop, Ubuntu Server, Ubuntu Cloud, and Ubuntu Base.
You’ll note NO flavor is mentioned, as they were all EOL at that release, and thus no ISOs were created, QA tested or released.
Either way we don’t support releases older than Lubuntu 22.04 LTS currently.