The following packages have unmet dependencies:x2goserver : Depends: perl-suid but it is not installable
E: Broken packages
Your are installing from Debian sid repos. For this to work you currently have to use this Deb URL (nightly builds):
deb http://packages.x2go.org/debian squeeze heuler
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Info: Proxy running in client mode with pid '4980'.
Session: Starting session at 'Thu Jul 21 23:21:30 2011'.
Info: Connecting to remote host 'localhost:30007'.
Info: Connection to remote proxy 'localhost:30007' established.
Warning: Connected to remote version 3.5.0 with local version 3.4.0.
Warning: Consider checking http://www.nomachine.com/ for updates.
Info: Connection with remote proxy completed.
Warning: Unrecognized session type 'unix-kde-depth_32'. Assuming agent session.
Warning: Failed to read data from the X auth command.
Warning: Generated a fake cookie for X authentication.
Info: Using ADSL link parameters 512/24/1/0.
Info: Using cache parameters 4/4096KB/8192KB/8192KB.
Info: Using pack method '16m-jpeg-9' with session 'unix-kde-depth_32'.
Info: Using ZLIB data compression 1/1/32.
Info: Using ZLIB stream compression 4/4.
Info: No suitable cache file found.
Info: Forwarding X11 connections to display 'localhost:2'.
Session: Session started at 'Thu Jul 21 23:21:31 2011'.
Info: Established X server connection.
Info: Using shared memory parameters 0/0K.
Warning: No data received from remote proxy within 34 seconds.