Ubuntu 6.06 "Dapper Drake" was the first Ubuntu LTS release way back in June 2006, and it's been a fun ride! But, all good things have to come to and end -- and the end is here for Ubuntu 6.06.
Ubuntu announced the end of life for Dapper Drake on June 1st -- they will be providing no more updates for this Ubuntu version.
Support for Virtualmin on Ubuntu 6.06 is coming to an end as well. There will be no more releases for this Ubuntu version; we recommend that users of Ubuntu 6.06 upgrade to 8.04 or 10.04, both of which have active support.
You can read the official Ubuntu 6.06 End of Life announcement here:
https://lists.ubuntu.com/archives/ubuntu-announce/2011-June/000149.html