virbr0 disappeared, kvm complains about a missing package, but bridge-utils is up to date, bridge.ko missing in 2.6.35-25?

[BRAAAADLEY]

When I try to start the default network in kvm, I get told a package is not installed.

LIBVIRT_DEBUG=1 libvirtd results in the following error:
14:58:08.218: error : networkStartNetworkDaemon:1106 : cannot create bridge 'virbr0': Package not installed
libvir: Network Config error : cannot create bridge 'virbr0': Package not installed

It also appears that bridge/bridge.ko modules are now missing from my kernel:

Linux acestop 2.6.35-25-generic #44-Ubuntu SMP Fri Jan 21 17:40:44 UTC 2011 x86_64 GNU/Linux

root@acestop:~# ls /lib/modules/2.6.35-25-generic/kernel/net/bridge [current kernel]
ls: cannot access /lib/modules/2.6.35-25-generic/kernel/net/bridge: No such file or directory
root@acestop:~# ls /lib/modules/2.6.35-24-generic/kernel/net/bridge [old kernel]
bridge.ko netfilter

At any rate, the result is that I can't create bridges and I can't use kvm anymore.

--
BRAAAAAAAADLEY