I forgot to mention, I was trying to install to a XFS partition. I tried to run grub-installer manually, and it warned me that grub would probably fail to work in a XFS partition.
-- [Dapper Flight7] fails to install grub https://launchpad.net/bugs/40630 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
