nix and mullvad vpn are installed on my steam deck under steamos 3.7 now but it's the same issue as before (Management RPC server or client error). Also I can open the Mullvad VPN GUI application which works but there is a message on the app :
Unable to contact the Mullvad system
service, your connection might be unsecure.
Please troubleshoot or send a problem
report by clicking the "Learn more" button.
I don't know how to solve this issue
I found the
mullvad-daemon,nix-daemonfiles in/nix/store/svf..............-user-environment/bin/mullvad, I don't know that's it. I copied and pasted both files into~/.config/systemd/user/then I open the terminal from~/.config/systemd/user/, I typedsystemctl --user enable mullvad-daemon.service, it says :Failed to enable unit: Unit mullvad-daemon.service does not exist