I'm use Oracle VM VirtualBox 3.2.8 (PUEL) on my Windows 7 as host.
I use seamless mode almost exclusively, and post upgrade to Ubuntu 10.10 the seamless mode is broken. Is there a way I can fix this or do I need to wait for the next release of VirtualBox?
(PS: I have looked at Lifehacker's article and other related blog posts, and none of them work for me)
I had to update to VirtualBox 3.2.10 to get the seamless mode back. Alternatively, if you don't want to update, you can just download the updated Guest Additions CD and install the new guest additions and it should work fine.
Install the package virtualbox-ose-guest-x11 on the Maverick guest.
Try VMWare Player. I'm not using Windows as host, but I have experienced other problems with Oracle VirtualBox in Lucid. After switching to VMWare Player everything works fine and the seamless mode, called Unity, works like a charm.
To convert your VirtualBox image to VMWare see this discussion (didn't try it).