You attempted to install grub to /dev/mapper/ubuntu--vg-root. It must be installed to a disk drive, like /dev/sda, not a logical volume. Also once the first attempt fails, all subsequent ones will as well.
** Changed in: grub-installer (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1555726 Title: Cannot install grub on any partition To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1555726/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs