Wallet compiling problems on Ubuntu 12.04 LTS - Windows-QT VM builder gitian.

I get the follow error:

ubuntu:~/gitian$ sudo bin/gbuild ../bitcoin/contrib/gitian-descriptors/qt-win32.yml

--- Building for lucid i386 ---
Stopping target if it is up
Connection timed out during banner exchange
Killing target since it did not shutdown within 10 seconds
Making a new image copy
Formatting 'target-lucid-i386.qcow2', fmt=qcow2 size=11811160064 backing_file='base-lucid-i386.qcow2' encryption=off cluster_size=65536
Starting target
Checking if target is up..........
Connection timed out during banner exchange
bin/gbuild:21:in `system!': failed to run on-target true (RuntimeError)
   from bin/gbuild:73:in `build_one_configuration'
   from bin/gbuild:218
   from bin/gbuild:213:in `each'
   from bin/gbuild:213
   from bin/gbuild:211:in `each'
   from bin/gbuild:211

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Any idea what goes wrong and/or what I can do about it?