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Workaround for cheatcode memtest:
su
aptitude update
aptitude install memtest86+
rm -f /mnt-system/boot/syslinux/memtest
cp /boot/memtest86+.bin /mnt-system/boot/syslinux/memtest
Workaround for...

Please have a look at the last message of Prof. Knopper:
https://lists.debian.org/debian-knoppix/2015/12/msg00002.html