Ubuntu guest on a Gentoo VServer

[EDIT] These instructions may not work any more, you should really go to http://linux-vserver.org and finhost to do it from there
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.