The root problem is the following (from Apttermlog):
Installing new version of config file /etc/grub.d/20_memtest86+ ...^M
Generating grub.cfg ...^M
Segmentation fault^M
/usr/sbin/grub-probe: Fehler: cannot stat `'.^M
dpkg: error processing memtest86+ (--configure):^M
subprocess installed post-in
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ubuntu-meta (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/951783
Title:
** Attachment removed: "VarLogDistupgradeAptclonesystemstatetargz.gz"
https://bugs.launchpad.net/bugs/951783/+attachment/2847002/+files/VarLogDistupgradeAptclonesystemstatetargz.gz
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ht
** Visibility changed to: Public
** This bug is no longer flagged as a security vulnerability
** Visibility changed to: Public
** This bug is no longer flagged as a security vulnerability
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