Процедура для віддаленого серверу, випробувано на переході 22 → 24:

1. Make backups.

2. Upgrade all packages:

sudo apt update
sudo apt dist-upgrade -o APT::Get::Always-Include-Phased-Updates=true
sudo systemctl reboot

3. Read release notes: https://ubuntu.com/project/docs/release-team/list-of-releases/

4. Check that there is enough free space

5. Run tmux:

tmux new -s upgrade

6. Start upgrade:

sudo do-release-upgrade