Had some problems getting a Ubuntu guest going on a Gentoo VServer host today, here are the tricks to get it working:

export ARCH=i386

vserver vubuntu build --force -m debootstrap /

--hostname vubuntu.dameaneys --netdev eth0 --interface 192.168.0.2/24 /

--context 1342 -- -d gutsy -m http://de.archive.ubuntu.com/ubuntu

Mostly a reminder for myself in the future.