Comment 7 for bug 2043907

this may tie into another bug that may or may not have been fixed. I have a Multiboot system. When I had it running with the MBR style of only one boot drive, grub kept getting overwritten with the other distro's. As long as it was one of the ubuntu flavors I had no issues but as soon as it was debian or fedora going to ubuntu it gave a shim mismatch error and would not boot. I ended up stripping out all of the boot selectors and then setting up an EFI partition on each distro's drive to keep them all separated to their own drive, then using the UEFI boot selector to set which drive and distro to boot from. this included telling the installer to use the drive that distro was going to and setting the EFI flag to datadrive on all the EFI boot partitions save the one that that distro was being installed to so it would not install on a different drive despite what it was told in the installer... updating is not an issue as it doesn't attempt to redo the drive mapping unlike the initial installer, anyways I degressed into another issue but it giving that mismatch may also extend to this issue...