title: grub error systemd.unified_cgroup_hierarchy=0: not found
body: <p>i am running on a vps debian 9 stretch</p>
  <pre><code>master@vps726152:~$ cat /etc/os-release
  PRETTY_NAME=&quot;Debian GNU/Linux 9 (stretch)&quot;
  NAME=&quot;Debian GNU/Linux&quot;
  VERSION_ID=&quot;9&quot;
  VERSION=&quot;9 (stretch)&quot;
  VERSION_CODENAME=stretch
  ID=debian
  </code></pre>
  <p>I started to have errors after an update when I tried an autoremove (sorry it is in french)</p>
  <pre><code>master@vps726152:~$ sudo apt autoremove
  Lecture des listes de paquets... Fait
  Construction de l'arbre des dépendances
  Lecture des informations d'état... Fait
  0 mis à jour, 0 nouvellement installés, 0 à enlever et 0 non mis à jour.
  2 partiellement installés ou enlevés.
  Après cette opération, 0 o d'espace disque supplémentaires seront utilisés.
  Paramétrage de 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: erreur de traitement du paquet linux-image-4.9.0-14-amd64 (--configure) :
   le sous-processus script post-installation installé a retourné une erreur de sortie d'état 1
  dpkg: des problèmes de dépendances empêchent la configuration de linux-image-amd64 :
   linux-image-amd64 dépend de linux-image-4.9.0-14-amd64 ; cependant :
   Le paquet linux-image-4.9.0-14-amd64 n'est pas encore configuré.
  
  dpkg: erreur de traitement du paquet linux-image-amd64 (--configure) :
   problèmes de dépendances - laissé non configuré
  E: Sub-process /usr/bin/dpkg returned an error code (1)
  </code></pre>
  <p>I made some diggings and found this error could be related to a grub problem so I tried this command :</p>
  <pre><code>master@vps726152:~$ sudo update-grub
  /usr/sbin/grub-mkconfig: 11: /etc/default/grub: systemd.unified_cgroup_hierarchy=0: not found
  </code></pre>
  <p>my grub conf looks like this :</p>
  <pre><code># 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_DEFAULT=0
  GRUB_TIMEOUT=5
  GRUB_DISTRIBUTOR=`lsb_release -i -s 2&gt; /dev/null || echo Debian`
  GRUB_CMDLINE_LINUX_DEFAULT=&quot;console=ttyS0&quot;
  GRUB_CMDLINE_LINUX=&quot;&quot;
  systemd.unified_cgroup_hierarchy=0
  
  # 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 ...)
  #GRUB_BADRAM=&quot;0x01234567,0xfefefefe,0x89abcdef,0xefefefef&quot;
  
  # Uncomment to disable graphical terminal (grub-pc only)
  #GRUB_TERMINAL=console
  
  # 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'
  #GRUB_GFXMODE=640x480
  
  # Uncomment if you don't want GRUB to pass &quot;root=UUID=xxx&quot; parameter to Linux
  #GRUB_DISABLE_LINUX_UUID=true
  
  # Uncomment to disable generation of recovery mode menu entries
  #GRUB_DISABLE_RECOVERY=&quot;true&quot;
  
  # Uncomment to get a beep at grub start
  #GRUB_INIT_TUNE=&quot;480 440 1&quot;
  </code></pre>
  <p>So this line seems to be the cause of my troubles</p>
  <pre><code>systemd.unified_cgroup_hierarchy=0
  </code></pre>
  <p>But I do not know what to do next, I found nothing helpful so far...
  Could someone help me please ?</p>