This bug was fixed in the package grub2 - 2.02~beta2-36ubuntu3.21
--------------- grub2 (2.02~beta2-36ubuntu3.21) xenial; urgency=medium
* debian/patches/squash4-fix-fragments-and-sparse-files.patch: Cherry-pick upstream patch to fix handling of fragments and sparse files in squashfs filesystems (LP: #1820898).
-- Colin Watson <email address hidden> Wed, 20 Mar 2019 00:31:55 +0000
This bug was fixed in the package grub2 - 2.02~beta2- 36ubuntu3. 21
--------------- 36ubuntu3. 21) xenial; urgency=medium
grub2 (2.02~beta2-
* debian/ patches/ squash4- fix-fragments- and-sparse- files.patch: Cherry-pick
upstream patch to fix handling of fragments and sparse files in squashfs
filesystems (LP: #1820898).
-- Colin Watson <email address hidden> Wed, 20 Mar 2019 00:31:55 +0000