VirtualBox host-only networking fails on Ubuntu 11.10 host

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http://askubuntu.com – I've installed Ubuntu 11.10 on a new Lenovo Thinkpad 420s and I'm trying to get some VirtualBox VMs up and running (using Vagrant). Everything works fine until I try to add host-only networking. This is the failure I get in the terminal: I set logging to debug and tried again. Here's a paste of the relevant portion of the log. When I try to add host-only networks with the VirtualBox gui (File->Preferences->Networking->Add host-only networking), I get the following error message: This error is occurring with three different virtual boxes, all Ubuntu 11.10 64bit guests, one of which I' (HowTos)