I follow this guide always to install x2go : https://wiki.x2go.org/doku.php/wiki:repositories:debian

the guide says to use this command:

$ apt-key adv --recv-keys --keyserver keys.gnupg.net E1F958385BFE2B6E

but http://gnupg.net  is down and seems to have a serious problem, you can see here

is there another way to install x2goserver without gnupg? 

thanks