hello,
i have been trying to live build a gnome variant on a 64bit Kali GNU/linux rolling, everything goes on well up until this point :

[2018-12-21 10:10:13] lb binary_linux-image
P: Begin install linux-image...
[2018-12-21 10:10:14] lb binary_memtest
P: Begin installing memtest...
Reading package lists...
Building dependency tree...
Reading state information...
Suggested packages:
hwtools memtester kernel-patch-badram grub2 | grub
Recommended packages:
memtest86+
The following NEW packages will be installed:
memtest86
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 45.5 kB of archives.
After this operation, 309 kB of additional disk space will be used.
Get:1 http://archive.kali.org/kali kali-rolling/main amd64 memtest86 amd64 4.3.7-3 [45.5 kB]
Preconfiguring packages ...
Fetched 45.5 kB in 2s (29.2 kB/s)
Selecting previously unselected package memtest86.
(Reading database ... 505899 files and directories currently installed.)
Preparing to unpack .../memtest86_4.3.7-3_amd64.deb ...
Unpacking memtest86 (4.3.7-3) ...
Processing triggers for man-db (2.8.4-3) ...
Setting up memtest86 (4.3.7-3) ...
/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).
dpkg: error processing package memtest86 (--configure):
installed memtest86 package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
memtest86
E: Sub-process /usr/bin/dpkg returned an error code (1)
P: Begin unmounting filesystems...
P: Saving caches...
Reading package lists...
Building dependency tree...
Reading state information...

i have tried to search on several platforms and the work arounds i have come across are not helping

running dpkg --configure -D 777 memtest86+ got me this:

D000001: ensure_diversions: new, (re)loading
D000001: process queue pkg memtest86+:amd64 queue.len 0 progress 1, try 1
dpkg: error processing package memtest86+ (--configure):
package memtest86+ is already installed and configured
Errors were encountered while processing:
memtest86+

chroot file:

# config/chroot - options for live-build(7), chroot stage

# $LB_CHROOT_FILESYSTEM: set chroot filesystem
# (Default: squashfs)
LB_CHROOT_FILESYSTEM="squashfs"

# $LB_UNION_FILESYSTEM: set union filesystem
# (Default: overlay)
LB_UNION_FILESYSTEM="overlay"

# $LB_INTERACTIVE: set interactive build
# (Default: false)
LB_INTERACTIVE="false"

# $LB_KEYRING_PACKAGES: set keyring packages
# (Default: empty)
LB_KEYRING_PACKAGES="kali-archive-keyring"

# $LB_LINUX_FLAVOURS: set kernel flavour to use
# (Default: autodetected)
LB_LINUX_FLAVOURS="amd64"

# $LB_LINUX_PACKAGES: set kernel packages to use
# (Default: autodetected)
LB_LINUX_PACKAGES="linux-image"

# $LB_SECURITY: enable security updates
# (Default: false)
LB_SECURITY="false"

# $LB_UPDATES: enable updates updates
# (Default: false)
LB_UPDATES="false"

# $LB_BACKPORTS: enable backports updates
# (Default: false)
LB_BACKPORTS="false"