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I recently switched from CentOS to Ubuntu. Grub can find my old CentOS /root XFS partition but fails to load it. At the emergency mode prompt I can manually mount the old centOS partition.

The journalctl log seem to imply that Grub thinks the partition is ext3 but it is XFS.

journalctl says

systemd[1]: Found device /dev/dm-5.
systemd[1]: Starting File System Check on /dev/dm-5...
systemd-fsck[2496]: fsck.ext3 doesn't exist, not checking file system on /dev/dm-5
systemd[1]: Started File System Check on /dev/dm-5.
systemd[1]: Started dracut initqueue hook.
systemd[1]: Reached target Remote File Systems (Pre).
systemd[1]: Reached target Remote File Systems.
systemd[1]: Mounting /sysroot...
mount[2522]: mount: unknown filesystem type 'ext3'
systemd[1]: sysroot.mount mount process exited, code=exited status=32
systemd[1]: Failed to mount /sysroot.
systemd[1]: Dependency failed for Initrd Root File System.
Jeremy Woodland
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    Did you format your disk before replacing the OS? Did you intend to set up dual boot? Ubuntu uses the ext4 file system by default. Related: https://askubuntu.com/questions/945337/ubuntu-17-04-will-not-boot-on-uefi-system-with-xfs-system-partition – Nmath Nov 04 '20 at 19:50
  • Ubuntu is running properly but I can't boot into the old OS. FWIW I installed Ubuntu into an existing LVM-ext3 partition that is working fine. I can also mount the olde CentSO /root file system after ubuntu is running. So the file systems themselves are fine. The problem IMO is in the grub configuration. I already ran update-grub - no change. – Jeremy Woodland Nov 04 '20 at 20:37

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