Using wipefs you can see that it has the remnants of btrfs on the raw
/dev/sda because I am an idiot.
root@build:~# wipefs /dev/sda
offset type
----------------------------------------------------------------
0x1fe dos [partition table]
0x10040 btrfs [filesystem]
LABEL: jf-002-001
UUID: 50f898e6-febe-486e-b8c9-bf728d7935ac
It would be useful if during the upgrade grub checks for this and spits out a
more useful warning at least and tells you to run wipefs -o 0x10040 /dev/xxx to
eliminate the fs. Grub updated but now it says:
/usr/sbin/grub-probe: warning: Couldn't find physical volume `(null)'. Some
modules may be missing from core image..
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https://bugs.launchpad.net/bugs/1385045
Title:
Grub fails during upgrade due to lingering BTRFS information on drive
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