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Installation fails, Keyserver general error

Hello there!
Im a first time user of Linux and Lutris. I just installed Mint Cinnamon 20.2, which is basically Ubuntu.
Steam and Proton worked great out of the box, but now I want to try Lutris and GOG.

The first step of the installation fails for me though:

sudo add-apt-repository ppa:lutris-team/lutris

leads to

mint@mint:~$ sudo add-apt-repository ppa:lutris-team/lutris
You are about to add the following PPA:
Stable releases for the Lutris client
More info: Lutris stable : “lutris” team
Press Enter to continue or Ctrl+C to cancel

Executing: /tmp/apt-key-gpghome.OB2PTJbfkO/gpg.1.sh --keyserver hkps://keyserver.ubuntu.com:443 --recv-keys 82D96E430A1F1C0F0502747E37B90EDD4E3EFAE4
gpg: keyserver receive failed: General error

Can anyone help me out?