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
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https://bugs.launchpad.net/bugs/1835909
Title:
grub-probe fails to recognize ext4 partition
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