Florian,

sorry for the delay in response, or for the double-post if someone's already help you solved your issue, but I thought I'd chime in as I may have had something similar. I have KVM running on an Ubuntu host and connect to it via virt-manager. At home on my Mac, I connect to it either directly via X11/SSH, or connect to my desktop via NX/x2go at work, and then to virt-manager on that desktop. In each case, the keyboard mapping is off by default when I type on a Mac - anything typed into the console view in virt-manager is mapped incorrectly. I have a workaround and that's to set each VM's keyboard mapping directly. If you run
virsh edit YourVMName

then set the node <graphics> with an additional element keymap to 'en-us' like so:
<graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1' keymap='en-us'/>

and then all my mac keys worked fine.

Hope this helps,
Neil

-----Original Message-----
From: x2go-dev-bounces@lists.berlios.de on behalf of Florian Effenberger
Sent: Thu 12/30/2010 10:56 AM
To: x2go-dev@lists.berlios.de
Subject: [X2go-dev] VirtualBox or KVM and x2go from Mac

Hi,

sorry for spamming this list, but I'm in the progress of setting up an
internal Document Foundation x2go server. :-)

I am having issues when using LXDE as desktop environment to control
VirtualBox or KVM (virt-manager) with x2go from Mac. Only some
commands seem to work -- if I boot e.g. Ubuntu in the virtual machine,
only page up works, but enter and page down to nothing in the
graphical GRUB boot menu, so the machine is unusable. I also tried
changing the keyboard settings in x2go client, to no avail. The same
server works just fine with the x2go client from Windows 7.

If I can be of any help in debugging, let me know ;)

Florian
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