This may be too little too late, but I managed to work around the issue a few days after posting this report. It had something to do with a dirty filesystem; possibly the UEFI system partition or either of the Windows-related partition. I ran a few fscks/chkdsks and attempted the install again, and it worked.
I'll leave this bug open for someone else to consider. I feel that the installer should have provided a slightly more insightful error rather than freezing, which is, IIRC, what happened. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1078363 Title: GRUB failed to install on 'dummy'. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1078363/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
