Comment 3 for bug 1874522

I've just had exactly the same problem trying to make a fresh install from a bootable USB created with Ubuntu 18.04 Startup Disk Creator tool.
The option I chose was a fresh install using an entire SSD disk and ZFS filesystem.
After the crash I killed ubiquity and a desktop session was opened. I launched the installation again and it went ok.
Both times I chose exactly the same install options, the only difference is that during my first installation attempt which failed I tried to open different install options several times but didn't proceed and just pressed Back to go to the main install option menu.
Thanks