Thanks for your report.
The error is
=====
Preparing to replace memtest86+ 1.70-3ubuntu1 (using
.../memtest86+_2.01-1ubuntu2_i386.deb) ...
Unpacking replacement memtest86+ ...
dpkg: error processing
/var/cache/apt/archives/memtest86+_2.01-1ubuntu2_i386.deb (--unpack):
unable to create `./boot/memtest86+.bin': Read-only file system
Searching for GRUB installation directory ... found: /boot/grub
Searching for default file ... found: /boot/grub/default
Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst
cp: cannot remove `/boot/grub/menu.lst~'
cp: cannot remove `/boot/grub/menu.lst~': Read-only file system
dpkg: error while cleaning up:
subprocess post-installation script returned error exit status 1
=====
Your /boot partition seems to be in read-only mode. Could you please set
it in rw mode in order to upgrade.
Thanks.
** Changed in: memtest86+ (Ubuntu)
Status: New => Incomplete
--
package memtest86+ 1.70-3ubuntu1 failed to install/upgrade:
https://bugs.launchpad.net/bugs/292629
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