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    Boot In Rescue Mode Or Emergency Mode In Ubuntu 20.04/18.04

    As you may already know, runlevels have been replaced by system md targets in many recent Linux distributions such as RHEL 7 / RHEL 8 and Ubuntu 16.04 LTS, but also in more recent versions. For more information on management levels and system errors, please refer to this manual. In this short guide we see how to start Ubuntu 20.04 and Ubuntu 18.04 in rescue or emergency mode in the LTS editions. This manual has been written especially for Ubuntu, but the next steps should work on most Linux distributions that use Systemd as their standard service manager. Before I go into that, I would like to explain what the rescue and emergency procedures are and what the purpose of these two procedures is.

    What is the rescue mode?

    The backup mode corresponds to the single-user mode in Linux distributions, which SysV uses as the default service manager. In recovery mode, all local file systems are mounted, only some important services are performed. However, normal services (such as network services) will not be introduced. The recovery mode is useful in situations where the system cannot start normally. We can also perform some important rescue operations, such as resetting the root password in rescue mode.

    What is emergency mode?

    Unlike rescue mode, nothing starts in emergency mode. There’s no service, no home base, no power outlets, nothing. All you get is a rough shell. The emergency mode is suitable for troubleshooting.

    We will first see how to start LTS distributions in rescue and emergency mode in Ubuntu 20.04.

    Switching to recovery mode in Ubuntu 20.04 LTS

    There are two ways to enter rescue mode.

    Method 1:

    Turn on your Ubuntu system. Immediately after the BIOS logo disappears, press the ESC key to display the Grub menu.

    In the GRUB menu, select the first shot and press e to edit.

    Editing the GRUB menu in Ubuntu 20.04

    Click the DOWN arrow and find a line beginning with the word linux and add the next line at the end. To reach the end, simply press the CTRL+e keys or use the END key or the LEFT/RIGHT arrows on the keyboard.

    Rescue objective

    Edit the items from the grubbing start menu to enter recovery mode in Ubuntu 20.04.

    After adding the above line, press Ctrl+x or F10 to enter recovery mode.

    Within a few seconds you will be in rescue mode (single user mode) as a root user. You will be prompted to press the ENTER key to enter the service mode.

    This is what the rescue mode in LTS Ubuntu 20.04 looks like:

    Starting in recovery mode in Ubuntu 20.04

    Now in rescue mode, do what you want. You may need to mount the root (/) file system in read/write mode before you can perform operations in recovery mode.

    mount -n -o mount, rw /

    Connecting the root file system in read-write mode in Ubuntu

    Then press Ctrl+d to start in normal mode. You can also enter one of the following commands to start in normal mode.

    System Standard

    Or..,

    Publication

    If you want to restart the system instead of doing it normally, enter :

    System Restart

    Method 2:

    With this method it is not necessary to edit the menu items of Grub Boot.

    Turn on the system and select Advanced Options for Ubuntu from the Grub Boot menu.

    Choose additional options from the Grub download menu in Ubuntu

    You will then see a list of available Ubuntu versions together with the kernel versions. Select the restore mode from Ubuntu’s Grub Boot menu.

    Select the restore mode from Ubuntu's Grub Boot menu.

    In a few seconds you will see the Ubuntu repair menu. From the restore menu, select Drop to root shell prompt and press the ENTER key.

    Enter the trunk line in Ubuntu

    You’re in rescue mode now.

    Ubuntu service mode

    Connect the root (/) file system in read/write mode by entering the following command:

    mount -n -o mount, rw /

    Do what you want in rescue mode.

    Then go to Exit to return to the Recovery menu.

    Publication

    Finally, select Restore Normal Boat and press ENTER.

    Normal Ubuntu load

    If you do not want to restart in normal mode, enter a restart mode from the service to restart the system.

    Emergency charging in Ubuntu 20.04 LTS

    When the GRUB start menu is displayed, press e to change it.

    Find a line beginning with the word linux and add the next line at the end.

    systemd.unit=emergency.target

    Edit the items in the grubbing start menu to switch to emergency mode in Ubuntu 20.04.

    After adding the above line, press Ctrl+x or F10 to enter emergency mode.

    In a few seconds you will be in emergency mode as root. You will be prompted to press the ENTER key to enter the service mode.

    Here you can see what the emergency mode looks like in LTS Ubuntu 20.04:

    Emergency Charging in Ubuntu 20.04 LTS

    Now, do what you want in emergency mode. You may need to mount the root (/) file system in read/write mode before you can perform operations in this mode.

    mount -n -o mount, rw /

    Then press Ctrl+d to start in normal mode. You can also enter one of the following commands to start in normal mode.

    System Standard

    Or..,

    Publication

    If you want to restart the system instead of doing it normally, enter :

    System Restart

    Sounds like reading:

    Switching to recovery mode in Ubuntu 18.04 LTS

    Download your Ubuntu system. When the Grub menu appears, select the first shot and press e to edit. (To reach the end, simply press CTRL+e or use the END key or the left/right arrows on the keyboard:)

    Grub Menu

    Grub Menu

    If you do not see the Grub’s menu, simply press the ESC key as soon as the BIOS logo disappears.

    Find a line beginning with the word linux and add the next line at the end of that line (to get to the end, simply press CTRL+e or use the END keys or the LEFT/RIGHT arrows on your keyboard) :

    Rescue objective

    Changing the menu of the larvae

    Changing the menu of the larvae

    After adding the above line, simply press CTRL+x or F10 to continue charging in recovery mode. Within a few seconds you will be in rescue mode (single user mode) as a root user.

    Here is what the rescue mode looks like on the LTS Ubuntu server at 18.04.

    Ubuntu rescue mode

    Ubuntu rescue mode

    Then type the following command to mount the root (/) file system in read/write mode

    mount -n -o mount, rw /

    Emergency taxation

    Charging Ubuntu in an emergency situation is similar to the method described above. When editing the Grub menu, replace systemd.unit=rescue.target with systemd.unit=emergency.target.

    Emergency mode

    After adding systemd.unit=emergency.target, press Ctrl+x or F10 to continue loading in emergency mode.

    Emergency state 1

    Ubuntu state of emergency

    Finally, you can mount the root file system with the read/write command :

    mount -n -o mount, rw /

    Switching between rescue and emergency and vice versa.

    If you’re in recovery mode, you don’t have to change the startup rhythm of the grub, like I said. Instead, simply enter the following command to immediately switch to emergency mode :

    System crash

    To switch from emergency mode to rescue mode, also enter the type:

    systemic support

    You now know what rescue and emergency modes are and how to switch to these modes on the Ubuntu 20.04 and Ubuntu 18.04 LTS systems. As I said before, the steps presented here will work on many of the latest versions of Linux using Systemd.

    Thank you so much for coming!

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