Comment 0 for bug 1820898

The grub version in xenial fails to read the pc-kernel 4.15 kernel snap.

To reproduce (thanks to Colin for the grub-fstest hint):

$ snap download pc-kernel --channel 18
$ grub-fstest pc-kernel_192.snap crc /vmlinuz

This fails with the xenial grub with:
grub-fstest: error: read error at offset 8096256: invalid xz chunk.

but it should work (works correctly with the grub2 from bionic).

Colin pointed to https://git.savannah.gnu.org/cgit/grub.git/commit/?id=951306c5094d2bfb46d5baedfde84a2015c4a3fa which may fix the issue.