I had to ask this from the Proton support, but then found the anser now on my own, while waiting for their response.

When you upgrade Proton Pass on Linux (Ubuntu in my case), you’re asked to verify the checksum. It’ considered best practice and I agree although I’m quite new to Ubuntu/Linux (former MacOS guy).

Anyway the instruction from Proton are

Confirm the package’s integrity. You can verify its checksum on Debian and Ubuntu-based distros with the following command: echo "<SHA512CheckSum> ProtonPass.deb" | sha512sum --check -

I tried this a bunch of times without success. But what is really meant is that you should open the file mentioned a few lines further down https://proton.me/download/PassDesktop/linux/x64/version.json and copy the checksum from there and modify the command provided by the instructions. So in this case (current version) you should run this command: echo "d6910cacbcd47a5510a67876b63934b7b74819d4659e36cc698edcd3042358f079351a667458c3ca3ada16ac31649063e50f7d37f00c69e51770fafb6ae50d4b ProtonPass.deb" | sha512sum --check -

Which will give you ProtonPass.deb: OK

Not that obvious if you’re new to the whole “linux scene”.

I think JetBrains do a better job by providing the JetBrains Toolbox to manage installation and upgrade of their software in a more user friendly UI based way.

Same goes for Tuta Mail that simply has the Debian app announcing there’s an upgrade and you click to apply it and the app restarts…

These ways are more user friendly and akin to what I’m accustomed to from being a Mac user for 25 years.

So if you like me need this extra help in understanding the upgrade instructions for Proton Pass, I hope this post will be of help. Or I find it again myself next time 😀