After using Joplin in a Windows/Android configuration for many months (syncing via Dropbox), I switched my laptop to Linux (Ubuntu 24.04), and everything worked great for two days, but today, Joplin simply displays, "In order to synchronise, please upgrade your application to version 3.0.0+"
Great. But how?
The Ubuntu App Center indicates I'm running the latest stable version (2.14.22) & the Ubuntu Software Updater indicates there are no available updates?
My guess here (and it's only a guess) is I did update Joplin on my Android the other day, so I'm suspecting that changed something?
I should point-out that both devices are normal/stable (not pre-release, or beta).
I'd imagine one of these 3 will help, but there's also the AppImage without the script, and other distribution specific packages that might come into play. If one of the ones above don't help, please let us know what OS you're using and if possible which installation format.