It’s okay if you use a regular OpenVPN client, but yes I agree that they could at least clarify that the Proton VPN client is broken for most Linux use-cases.
"Logical server not found" happened 132 times while out of town for two days. I also use an Ubuntu LTS pretty recently reinstalled with minimal network customization, so I guess that other person was very lucky. This happens on two different Ubuntu computers with different graphics cards and CPU vendors so I don't think I'm imagining things.
If I enable the kill switch, it can convince itself there is no network connection (for itself) because of its own kill switch. I turn the kill switch off and back on and it's fine. That's ridiculous.
They only support udp and tcp in their Linux app. The Android app literally has more features and stability.
On the other hand, now that I've switched to mullvad everything is at least apparently fine. I've been submitting error logs to proton for years, I was one of their first customers and really really wanted them to be good. Instead they just ask me to switch between tcp and udp over and over to provide new logs despite not installing a new version. It's pathetic.
And no, I don't buy the Linux market share thing when it's a VPN! Lol, it's not a video game. Their competitors seem to work great and value the Linux market. Years is enough patience, they redesigned their logo, released drive, and released this without fixing the basic issues with their existing products.
I'm done trying, it's wasting so much time trying to deal with their support now that they clearly just don't care about it. So I'm done.
In the end, we can only rely on anecdotal evidence, but my experience is that it doesn't work on NixOS and the issues are also mostly full of people who encounter multiple problems [1, 2, 3].
I don't know what I did to get so lucky. I'm on Ubuntu and have the following versions: cli@3.13.0, protonvpn-nm-lib@3.14, proton-client@0.7.1
I've even written a couple of tools that manage my connection through the CLI automatically and it all Just Works. The only issue I ever had was when I had to force shutdown my machine for an unrelated reason and I didn't have an internet connection until I opened and closed Proton VPN. I'm sure someone smarter than me could have just reset the interface they were using or something