Ubuntu notes

As of 2025 Q2 Ubuntu server dist upgrades require a package which is not installed in minimal Ubuntu install processes. To install the automating distribution upgrader (note 1):

 $ sudo apt install ubuntu-release-upgrader-core

To start the distribution upgrade:

 $ sudo apt do-release-upgrade

When disk space is too small on a partition . . .

• https://runcloud.io/blog/used-disk-space-linux#using-built-in-utilities-to-check-disk-usage

 $ du -s * | sort -nr | head -n10

To safely remove an old kernel image and related files from /boot . . .

Notes

(1) https://www.cyberciti.biz/faq/ubuntu-bash-do-release-upgrade-command-not-found/