I had to install AIR itself via http://www.ubuntubuzz.com/2012/08/how-to-install-adobe-air-on-ubuntu-1204.html and then the .deb from our download page installs fine, as sadly it appears Adobe are no longer publishing it in their main repository : https://launchpad.net/ubuntu/+source/adobeair/
And so the GUI (certainly in KDE) says it can't install our installer because it has no idea where to find the AIR runtime from. At the very least I think I should write a page on our Wiki, and we should link there from the download page 'for Linux users' ? And then there is the issue that although the installer is installed, and appears in the menus, for some reason it closes immediately after launch, though it's fine from the command line. Still debugging that one :-) -- Tom If people didn't have fantasies they wouldn't be people.