Problem solved. There was a USB stick plugged directly in to the motherboard which I had forgotten about since changing this box over from a freeNAS install. Once that was removed, the install completed with no hangup.
I'll include the output from the point where it was hung. Both from ps, and from the full os-prober output in syslog. At this point, I'm happy to close the issue, but if you would like any further testing on this setup, I'd be willing to support that. I'm not sure if you would expect a USB drive to hang up the install or not. The USB stick was the boot drive for freeNAS, so the primary partition was formatted as ZFS. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1770173 Title: 18.04 install stuck on grub install To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/os-prober/+bug/1770173/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
