Hi, thanks for report, from logs:
...
Configuration file '/etc/grub.d/20_memtest86+'
==> Deleted (by you or by a script) since installation.
==> Package distributor has shipped an updated version.
What would you like to do about it ? Your options are:
Y or I : install the package maintainer's version
N or O : keep your currently-installed version
D : show the differences between the versions
Z : start a shell to examine the situation
The default action is to keep your current version.
*** 20_memtest86+ (Y/I/N/O/D/Z) [default=N] ? n
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
/usr/sbin/grub-probe: error: failed to get canonical path of
`/boot/grub/unicode.pf2'.
No path or device is specified.
Usage: grub-probe [OPTION...] [OPTION]... [PATH|DEVICE]
Try 'grub-probe --help' or 'grub-probe --usage' for more information.
dpkg: error processing package memtest86+ (--configure):
installed memtest86+ package post-installation script subprocess returned
error exit status 64
I suppose is unexpected cases of you custom grub configuration keeped or
another unexpected cases with grub but in this latest case I need more
informations to understand how to avoid it (if possible from memtest86+
package)
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https://bugs.launchpad.net/bugs/1971624
Title:
package memtest86+ 5.31b+dfsg-4 failed to install/upgrade: installed
memtest86+ package post-installation script subprocess returned error
exit status 64
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