New to Boxcryptor - looking at using it to encrypt the contents of my Onedrive a couple of question if anyone can help please,
you can use the free version, with which you can use two devices and one cloud provider, if you do not plan to get a 3rd device or a 2nd cloud, this should be sufficient.
Regarding Ubuntu, you could use the portable version: https://www.boxcryptor.com/en/help/quickstart/portable/#install-boxcryptor
I use boxcryptor portable on Linux Mint 20. It works. But it is not user friendly. It is too cumbersome.
Same with Android.
I also use it on Win10. There it is great. Hope sometime it will be possible to get boxcryptor for Linux as for Win.