Public bug reported: On a recent Bionic Azure image, the command
grub-probe --device /dev/sda1 --target=fs_uuid fails with grub-probe: error: not a directory. The reason for this seems to be that grub-probe finds the minixfs superblock magic 0x138F at offset 00000410 8f 13 3a 00 00 00 00 00 02 00 00 00 02 00 00 00 |..:.............| then assumes it has found a minixfs-formatted partition and exits with an error when it cannot access it, instead of trying other filesystems first. I don't know what the ext filesystem has stored at that position, and whether it is straight-forward to fabricate this manually. To reproduce this, you may launch the Azure Bionic image with urn Canonical:UbuntuServer:18.04-LTS:18.04.201906271 ** Affects: grub2 (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1835909 Title: grub-probe fails to recognize ext4 partition To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1835909/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs