I had the same problem and I just pressed NumLock and the Launcher hid itself immediately. Idea taken from here https://bugs.launchpad.net/ubuntu/+source/unity/+bug/772817
I had the same problem and I just pressed NumLock and the Launcher hid itself immediately. Idea taken from here https:/ /bugs.launchpad .net/ubuntu/ +source/ unity/+ bug/772817