Jailkit in Ubuntu 14.04

Hi all,

I want to use the Jailkit feature of Virtualmin 6 (GPL) at my Ubuntu 14.04 server. Reading a lot of forum topics and support issues I still have no glue how to get the Jailkit package installed.

Here are some hints that did not help though:

1. apt-get install jailkit does not work because the package is not available.
2. Use the VM 6 repository: Error /vm/6/gpl/ubuntu was not found on this server when trying http://software.virtualmin.com/vm/6/gpl/ubuntu.
3. Install jailkit from an Ubuntu PPA: Is not to an option because Jailkit seems to be modified to be usable in Virtualmin.
4. The enable vm6 features and migrate to vm6 repos tools sounds promising but may not to be available yet.

So far no luck. Did I miss something? Any further hints how I get Jailkit installed?