How to get Linux Mint Recovery Mode


Linux Mint Recovery Menu

If Linux Mint is installed on the computer and no other operating systems are available, the Grub Boot menu is hidden by default. In order to get the Grub menu at startup, the right shift key has to be pressed after switching on, unfortunately this does not work with virtual machines, here you have to set up the Grub menu persistently.

Enable Grub Menu on Linux Mint

If the Grub menu should appear at each start to get the recovery menu for system repairs, or to pass kernel parameters, edit the file 90_custom.cfg as root:

First become root with sudo su –

and add the following lines:

If the file 90_custom.cfg does not exist, simply create it with an editor of your choice.

After editing, run the following command:

Reboot: The grub boot menu will appear the next time you start.

Grub Menu

Choose the second entry Advanced options for Linux Mint 20.

Grub Recovery Menu

The recovery menu with repair options and the root shell appears promptly.

Root shell prompt

Choose Drop to root shell prompt that opens the Single Mode Console.

Drop to root shell prompt

Recovery Mode (Single Mode)

Enter in maintenance console. Here you are root and have write permissions on the file system. The single-user runlevel is the lowest operating state for maintenance, in which only system resources such as hard drives or file systems are active.

root password forgotten

Here are some of the most self-inflicted errors. If the root password has been forgotten, a new one can now be assigned.

sudo rulebook plugin could not be initialized

Improper changes to the sudoers file may result in errors.

If sudo is no longer possible in the standard runlevel and you have locked out yourself as root, sudo can be restored.

Before /etc/sudoers can be changed, the file must be given write permission.

After editing, sudoers must be protected again.

Here is the sudoers original file of Linux Mint 20 in case it has been changed to unusable. Note! Changes should always only be made with visudo.

Hard drive has no free memory

If there is no more free disk space, the logs can no longer be saved, which leads to system downtime, here the memory allocation can be checked in the Single User Mode Console to create free memory again.

If the tree command does not exist on the system, one of the following (disk usage) commands can help.

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