I have downloaded two copies, different versions, using Flathub. They both show up in my Linux apps on the Chromebook. How do I delete the older version? Obviously, I know very little about Linux.
An example would help, e.g.
flatpak list | grep APP-ID.
Anyway, if you have two copies of the same APP-ID and you run
flatpak uninstall APP-ID you’ll be asked which one you want to remove.
If the installed apps have different branches, you can specify which branch you want to remove, e.g.
flatpak uninstall APP-ID//BRANCH.
There’s no such an example where a first user might expect it:
but it’s explained before in the docs: