mdadm volumes can be shared between multiple linux installs no differently than regular disk partitions. When installing to a fakeraid, you must install grub to the raid device, which in your case is /dev/mapper/pdc_chdhbbcagj, rather than an individual disk ( /dev/sda ).
** 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/1164831 Title: Installing on MSI motherboard 870U-G55 with fake raid controller. One 1.2TB and one 2.8TB Raid partition. Installed to 1.2TB. Failed to install boot loader. Critical error.er To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1164831/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs