mathiaz@mathiaz-srv:~/vm/images$ sudo ubuntu-vm-builder --no-opt --mirror http://localhost:3142/ubuntu/
Not building /opt
Setting Ubuntu mirror to "http://localhost:3142/ubuntu/"
/usr/bin/ubuntu-vm-builder: line 426: MOUNTSIZES[]: bad array subscript
/usr/bin/ubuntu-vm-builder: line 426: MOUNTSIZES[]: bad array subscript
/usr/bin/ubuntu-vm-builder: line 427: PARTITION_END[]: bad array subscript
/usr/bin/ubuntu-vm-builder: line 427: PARTITION_END[]: bad array subscript
Formatting 'root.raw', fmt=raw, size=1024 kB
Disk: a root
  creating partition root on root
Error: The location 1000 is outside of the device /tmp/jeos-builder-oKFjr22840/root.raw.
  creating partition swap on root
gpt: 0 slices
dos: 4 slices
formating /dev/mapper/loop0p1 as ext3 for root
mke2fs 1.40.3 (05-Dec-2007)
Could not stat /dev/mapper/loop0p1 --- No such file or directory

The device apparently does not exist; did you specify it correctly?
/dev/mapper/loop0p1: error opening volume
formating /dev/mapper/loop0p2 as swap for swap
/dev/mapper/loop0p2: No such file or directory
/dev/mapper/loop0p2: error opening volume
I: Retrieving Release
I: Retrieving Packages