Kubuntu 16.04.1 installer can be minimized during installation, but not unminimized

I have just found with the Kubuntu 16.04.1 64-bit (I assume that it is the same with the 32-bit one) that if I press the minimize button on the top of the installer that it freezes for about 5 seconds and then completely disappears and I can't get it back. Also no matter how long I wait (I waited for 2 hours and before I minimized it it was nearly complete) it doesn't at any point tell me that it is done and a restart can be performed. So after 2 hours of waiting I performed a restart anyway, and I had big problems when I started Kubuntu because it appeared as though it hadn't installed everything needed, in fact it was almost like me minimizing it caused it to pause the installation or something, I don't know.