sudo cowbuilder --create --basepath /var/cache/pbuilder/base-precise-amd64.cow --distribution precise --debootstrapopts --arch --debootstrapopts amd64
 -> Invoking pbuilder
  forking: pbuilder create --debootstrapopts --arch --debootstrapopts amd64 --buildplace /var/cache/pbuilder/base-precise-amd64.cow --mirror http://ftp.ubuntu.com/ubuntu/ --architecture amd64 --distribution precise --no-targz --extrapackages cowdancer
I: Running in no-targz mode
I: Distribution is precise.
I: Building the build environment
I: running debootstrap
/usr/sbin/debootstrap
E: No such script: /usr/share/debootstrap/scripts/precise
E: debootstrap failed
W: Aborting with an error
pbuilder create failed
  forking: rm -rf /var/cache/pbuilder/base-precise-amd64.cow