Comment 8 for bug 1893964

Manual workaround for those who are affected:

1. Start Ubiquity by running 'ubiquity -b' (doesn't install grub and will not trigger this bug)
2. After installation is completed, don't reboot and install grub manually with the following commands in a terminal (assuming your have installed Ubuntu to /dev/sda1, change accordingly):

sudo mkdir uroot
sudo mount /dev/sda1 uroot
sudo mount -o bind /dev uroot/dev
sudo mount -o bind /sys uroot/sys
sudo mount -t proc /proc uroot/proc
sudo chroot uroot
grub-install /dev/sda1
update-grub
exit
sudo umount uroot/proc
sudo umount uroot/sys
sudo umount uroot/dev
sudo umount uroot

3. Then reboot, new installation should boot up fine.