I'm running Ubuntu 11.10 with kernel 3.3rc6. I tried to install Virtualbox 4.1.8 with the AMD64 .deb package off the virtualbox site. On install I got a kernel panic saying "unable to handle kernel paging request at ffff...".
When I reboot into Ubuntu now, just after it boots up, it starts to run unattended upgrades and I again get:
* Starting VirtualBox kernel modules unable to handle kernel paging request at ffff... ...etc
I booted up okay on recovery mode, but when I shut down the system it gets stuck on:
* Stopping VirtualBox kernel modules
and I have to manually power down.
If I try
sudo apt-get remove virtualbox-4.1, it similarly gets stuck while stopping the virtualbox kernel modules.
At the moment I'd be happy just removing the problematic install so my system boots up okay. I don't really need virtualbox right now, but I do need a working system. Thanks for the help!