"A warning message prompted you that this could be a problem and recommended performing a bios mode install instead, but you chose not to."
That's not entirely right. The warning message said that there would be a possible problem booting _other_ operating systems installed on the disk afterwards. As I had no other operating systems other than the one I was upgrading, I chose to continue. If in fact there are other reasons for not continuing in this situation, the message needs updating to be more clear and explain what to do differently . So I am reopening this bug. ** Changed in: grub-installer (Ubuntu) Status: Invalid => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1694446 Title: Installer crashes when trying to upgrade 32-bit system to 64-bit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1694446/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs