Reinstalling Sanity

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Create /etc/rc.local, containing:

  #!/bin/sh -e
  #
  # rc.local
  #
  # This script is executed at the end of each multiuser runlevel.
  # Make sure that the script will "exit 0" on success or any other
  # value on error.
  #
  # In order to enable or disable this script just change the execution
  # bits.
  #
  # By default this script does nothing.

  su -l slack -c "VBoxManage startvm alito --type=headless"
  exit 0

Change permissions:

  chmod +x /etc/rc.local

Activate it by adding the following content to /etc/systemd/system/rc-local.service:

  [Unit]
  Description=/etc/rc.local
  ConditionPathExists=/etc/rc.local
  
  [Service]
  Type=forking
  ExecStart=/etc/rc.local start
  TimeoutSec=0
  StandardOutput=tty
  RemainAfterExit=yes
  SysVStartPriority=99
  
  [Install]
  WantedBy=multi-user.target

Enable the rc-local script on boot:

  systemctl enable rc-local

Start the rc-local script:

  systemctl start rc-local.service

Check if any error occurred while starting the service:

  systemctl status rc-local.service