This bug was fixed in the package memtest86+ - 5.01-3.1ubuntu2.1
--------------- memtest86+ (5.01-3.1ubuntu2.1) focal; urgency=medium
* Close FD 3 when invoking update-grub (LP: #1876506)
-- Julian Andres Klode <email address hidden> Tue, 18 Aug 2020 12:46:05 +0200
This bug was fixed in the package memtest86+ - 5.01-3.1ubuntu2.1
---------------
memtest86+ (5.01-3.1ubuntu2.1) focal; urgency=medium
* Close FD 3 when invoking update-grub (LP: #1876506)
-- Julian Andres Klode <email address hidden> Tue, 18 Aug 2020 12:46:05 +0200