This is still an issue in 17.10 beta 1 (xubuntu 32 bits). In my case, I created LVM partitions, and ubiquity suggested to install grub on dm-0, that sounded odd to me, but I tried it. Grub failed to install. I could select new destination in the window, to try, bug nothing happen when I accepted. Also, giving up installation option, was not responding either. Pretty much like what I remembered from previous versions. I don't know about unomounting /target/dev as the original poster said however. I finally 'sudo killall ubiquity' to give up installation and give better options (created a boot 30M boot partition before installing).
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1267922 Title: Installer becomes confused and crashes when grub-install fails To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1267922/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs