OK, now I updated my dapper to edgy and it works. maybe it didn't work only when using X/compiz on the liveCD? will mark the bug as rejected.
** Changed in: xorg-server (Ubuntu) Status: Unconfirmed => Rejected -- gnome-terminal transparency doesn't work in compiz/AIGLX https://launchpad.net/bugs/59209 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs