Ubuntu 18.04.6 LTS Released with Critical Security Fixes

No, you’re not misreading the title, Ubuntu 18.04.6 LTS is available to download. This (unplanned) point release arrives with one key — pun intended — purpose: to make Ubuntu 18.04 LTS bootable again on Secure Boot-enabled systems. Why did it stop booting? “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,” writes Canonical’s Łukasz Zemczak explains in the release announcement. The BootHole vulnerability is explained in more detail on the Ubuntu blog as well on the Ubuntu
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https://www.omgubuntu.co.uk/2021/09/ubuntu-18-04-6-lts-released-with-critical-security-fixes