I am using Omarchy and when I installed the proton-vpn-gtk-app package and tried connecting, it displayed the generic error message "Something went wrong | An unexpected error has occured". I had to check the logs to figure out that the reason why it was failing was that the NetworkManager.service daemon was not running, because Omarchy uses systemd-networkd. Unless there's a skill issue on my end, I would like to suggest displaying a more clear error message when that happens, so the users quickly know to switch to NetworkManager if they need to use Proton VPN.