I’ve updated the Ubuntu PPA for KDocker. 4.4 is now packaged for Ubuntu 10.04 and 10.10. I wasn’t planning on continuing with the PPA but it was requested by a user.
I plan to keep the PPA going for the latest released version and the latest LTS version until Ubuntu decides to include non-borken and up to date (at least the version released months before the Ubuntu release) packages.