If you try to install Ubuntu or Mint Linux using a Debian-Family Template fails.

The proxy tries to download the kernel and initrd-image from

http://archive.ubuntu.com/ubuntu/dists/oneiric/main/installer-amd64/current/images/netboot/debian-installer/amd64/

where the path on the server is:

http://archive.ubuntu.com/ubuntu/dists/oneiric/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64/
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(ubuntu-installer instead of debian-installer)