A simple script to upgrade Mullvad VPN on Debian and Ubuntu Linux.
It will download both the Mullvad VPN client and its corresponding PGP signature file. The script then imports the Mullvad PGP key, verifies the PGP signature of the downloaded client package, and proceeds with the installation only if the signature verification is successful.
Please note that you need to have GnuPG (gpg) installed on your system for PGP signature verification. Also, make sure to review the script and ensure it meets your requirements before running it.
