When grub fails, a dialog is presented in the current version. It provides options to install grub to another disk / partition, to cancel the install, or to continue without installing grub. It notes that the latter two options will probably result in an unbootable system. None of the options seem to be active, however. I tried each of them in turn, selecting "OK" each time. The dialog is never dismissed and the install cannot continue. The only way out was to kill ubiquity. Of course, this was after grub failed to install to /dev/sda, so the system was not bootable, as described in the original bug report.
When grub fails, a dialog is presented in the current version. It provides options to install grub to another disk / partition, to cancel the install, or to continue without installing grub. It notes that the latter two options will probably result in an unbootable system. None of the options seem to be active, however. I tried each of them in turn, selecting "OK" each time. The dialog is never dismissed and the install cannot continue. The only way out was to kill ubiquity. Of course, this was after grub failed to install to /dev/sda, so the system was not bootable, as described in the original bug report.