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Note: Using Ubuntu 16.04 LTS Xenial
add-apt-repository ppa:x2go/stable apt update apt install x2goserver x2goserver-xsession apt install mate-desktop mate-icon-theme mate-session-manager
*/etc/profile.d/x2go-mate.sh*:
#!/bin/bash export GSETTINGS_SCHEMA_DIR=/usr/share/mate:/usr/share/mate:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop export XDG_DATA_DIRS=/usr/share/mate:/usr/share/mate:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop