That is correct behavior. You had many Qt 4 packages installed, however Qt 4 was removed from Ubuntu, and it conflicts with the latest version of Qt 5. So you need to remove Qt 4 in order to upgrade Qt 5.
** Changed in: qtbase-opensource-src (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1887959 Title: Unable to upgrade several qt5 packages (libqt5gui5, …) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1887959/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs