That is not useful information. It only indicates that someone with package commit privileges decided to package Drupal 6 for Ubuntu 11.10. It doesn't mean anything about usage, developers, community, etc.
To put this into perspective, Debian once had a Webmin package in the distant past (about 10 years ago)...at a time when we had far less than a million new downloads per year (might have even been in the low hundreds of thousands). We're currently at about 3 million new downloads a year, and growing every year, and there is no Ubuntu or Fedora package for Webmin.
All you can assert based on a lack of packages in the standard OS repo is that there is a lack of packages in the standard OS repo.
To put this into perspective, Debian once had a Webmin package in the distant past (about 10 years ago)...at a time when we had far less than a million new downloads per year (might have even been in the low hundreds of thousands). We're currently at about 3 million new downloads a year, and growing every year, and there is no Ubuntu or Fedora package for Webmin.
All you can assert based on a lack of packages in the standard OS repo is that there is a lack of packages in the standard OS repo.