I have this error since a couple of month after each upgrade

>     master@vps726152:~$ sudo apt autoremove
>     Reading package lists... Done
>     Building dependency tree
>     Reading state information... Done
>     0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
>     2 not fully installed or removed.
>     After this operation, 0 B of additional disk space will be used.
>     Setting up linux-image-4.9.0-14-amd64 (4.9.246-2) ...
>     /etc/kernel/postinst.d/initramfs-tools:
>     update-initramfs: Generating /boot/initrd.img-4.9.0-14-amd64
>     /etc/kernel/postinst.d/zz-update-grub:
>     /usr/sbin/grub-mkconfig: 11: /etc/default/grub: systemd.unified_cgroup_hierarchy=0: not found
>     run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 127
>     dpkg: error processing package linux-image-4.9.0-14-amd64 (--configure):
>      subprocess installed post-installation script returned error exit status 1
>     dpkg: dependency problems prevent configuration of linux-image-amd64:
>      linux-image-amd64 depends on linux-image-4.9.0-14-amd64; however:
>       Package linux-image-4.9.0-14-amd64 is not configured yet.
>     dpkg: error processing package linux-image-amd64 (--configure):
>      dependency problems - leaving unconfigured
>     Errors were encountered while processing:
>      linux-image-4.9.0-14-amd64
>      linux-image-amd64
>     E: Sub-process /usr/bin/dpkg returned an error code (1)

Debian is running on a VPS

> PRETTY_NAME="Debian GNU/Linux 9 (stretch)" NAME="Debian GNU/Linux"
> VERSION_ID="9" VERSION="9 (stretch)" VERSION_CODENAME=stretch
> ID=debian

What's wrong ? and how can I fix it ?

here is my grub

    # If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)

# Uncomment to disable graphical terminal (grub-pc only)

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux

# Uncomment to disable generation of recovery mode menu entries

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

And changed into (just the first block)

GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`

Seems to fix the problem. Thansk a lot.

1 Answer 1


Look at your /etc/default/grub file: it contains a line starting with systemd.unified_cgroup_hierarchy=0, which isn’t valid.

That configuration statement should go in the line starting with GRUB_CMDLINE_LINUX_DEFAULT. Move it there, and everything should be fine. If you don’t see how to fix things, edit your question to add the full contents of /etc/default/grub and I’ll update this to let you know what to do.

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