Virtual box-Ubuntu problem solving in use

The original application can not be saved monitor configuration

• Enter the terminal (two ways)
  • Ctrl+Alt+T
  • Right -> enter the terminal
• Delete files monitors.xml
  • rm .config/monitors.xml

• Restart the virtual machine
  to restart the virtual machine after the loss of system users, but unfortunately, continue to repair

  Virtual box-Ubuntu system users to retrieve lost

• Enter the terminal
  • sudo su -c “apt-get update”
  • sudo su -c “dpkg —configure -a”
  • sudo su -c “apt-get -f install”

• Restart the virtual machine