Hi Is there a way to upgrade the existing xubuntu LTS 20.04 installation to LTS 22.04 from CD? I have multiple installations, and don't want to repeatedly download the new version.
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add the CD path to software & update other software by adding the details for the CD. then you should be able to update via CD. my entry is ...
cdrom:[Xubuntu 22.04.1 LTS jammy jellyfish -release amd64 (20220809.1)]
tick the box and reload the software updater then use it to check for updates and it will load the updates from the CD ...