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Official packages for Debian:
Newer / more packages for Debian provided by X2Go upstream:
Newer client versions and X2Go Server + Add-Ons are available in X2Go upstream's PPA(s) on Launchpad. The team creating and updating packages for Ubuntu and its derivates is found here: https://launchpad.net/~x2go
Here's an overview of the current PPAs for Ubuntu and derivates - this list is also found on the teams Launchpad page.
Follow the instructions given on the different PPA pages on how to add the PPA of choice to your system.
There are official Fedora rpms for x2goclient, x2goserver, and the pyhoca clients.
There is also: