Daniel, you need to add: deb http://cz.archive.ubuntu.com/ubuntu/ dapper-updates main restricted universe multiverse
to your sources list, and sudo apt-get update, and the problem will go away. ** Changed in: qt-x11-free (Ubuntu) Status: Unconfirmed => Rejected -- Can't install libqt3-mt-dev https://launchpad.net/bugs/56209 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs