There are no builds for Ubuntu 12.xx or CentOS 6.xx, because there are no Gtk3 graphics libraries I can use. I can likely still maintain the 5.xx series (using the older Gtk2 libraries) as long as there are users for them.
For Debian and Ubuntu, start with this:
sudo dpkg -i clamtk_6.00-1_all.deb
If you see something like this:
dpkg: dependency problems prevent configuration of clamtk: clamtk depends on libgtk3-perl; however: Package libgtk3-perl is not installed.
Then type this:
sudo apt-get -f
I've also started including Minisign files for verification. Right now it's only for the source file (.xz). If you don't feel like switching, or just plain like GPG, you can still use that: the rpms, deb, and .xz are signed. For instructions on how to use Minisign, the ClamTk Wiki page has instructions. The README.md file has instructions.