Comment 11 for bug 1761377

Experienced it as well when installing Kubuntu 18.04, with a minor difference: after I selected "Retry" the installer allowed me to continue. I manually partitioned, etc., but the process hanged at 93% when reinstalling previous packages; I got a popup informing me that I'd need to manually reinstall them later. Then, the installer itself went down entirely.

I'd note that this was a fresh install from USB attempted after an attempt to upgrade from 17.10 to 18.04 destroyed my graphical environment. (Initially, I got no login screen at all; after extensive tinkering with lightdm and sddm, Xorg, and my proprietary Nvidia drivers, I was able to get login screens (a Gnome-styled one with lightdm which didn't accept my password, oddly, and the KDE-styled one with sddm that just gave a black or frozen screen after). Machine is an old Lenovo W530 Core i7 with an Nvidia graphics card.