High-speed Swiss VPN that safeguards your privacy.
Copy
/var/lib/flatpak/app/com.protonvpn.www/current/active/export/share/applications/com.protonvpn.www.desktop
if Proton VPN is installed to the system; or~/.local/share/flatpak/app/com.protonvpn.www/current/active/export/share/applications/com.protonvpn.www.desktop
if Proton VPN is installed to the user
to ~/.config/autostart/
.