• https://wiki.x2go.org/doku.php/wiki:repositories:debian
• https://wiki.x2go.org/doku.php/doc:installation:x2goserver

apt-key adv --recv-keys --keyserver keys.gnupg.net E1F958385BFE2B6E
vim /etc/apt/sources.list.d/x2go.list

# X2Go Repository (release builds)
deb http://packages.x2go.org/debian buster extras main
# X2Go Repository (sources of release builds)
deb-src http://packages.x2go.org/debian buster extras main

# X2Go Repository (Saimaa ESR builds)
#deb http://packages.x2go.org/debian buster extras saimaa
# X2Go Repository (sources of Saimaa ESR builds)
#deb-src http://packages.x2go.org/debian buster extras saimaa

# X2Go Repository (nightly builds)
#deb http://packages.x2go.org/debian buster extras heuler
# X2Go Repository (sources of nightly builds)
#deb-src http://packages.x2go.org/debian buster extras heuler

apt update
apt -y install pyhoca-gui x2goclient x2go-keyring x2goserver x2goserver-xsession

~~DISCUSSION~~