How do I boot into single-user mode from GRUB?


Q. How do I boot a Linux system into single user mode?

A. Single user mode is useful to fix some system problem. Following are steps you need to use to boot Grub boot loader into single user mode.

Procedure: Boot Linux Grub Boot Loader into single user mode

(1) At grub boot screen (after restart)

(2) Select the kernel

(3) Press the e key to edit the entry

(4) Select second line (the line starting with the word kernel)

(5) Press the e key to edit kernel entry so that you can append single user mode

(6) Append the letter S (or word Single) to the end of the (kernel) line

(7) Press ENTER key

(8) Now press the b key to boot the Linux kernel into single user mode

(9) When prompted give root password and you be allowed to login into single user mode.


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Image Result For How Do I Boot Into Single User Mode From Grub Ask Ubuntu

To boot into single user mode you edit the boot instructions for the GRUB menu entry you wish to boot and add the kernel parameter option single . Brief instructions for how to do this are below. Hold down the left Shift key while rebooting to bring up GRUB menu Select highlight the GRUB boot menu .I ve found the answer I had to hold shift to see the GRUB menu. .The above answer describes how to make a Linux GRUB host box boot to single user mode as the permanent default option. One can also make this a permanent but {non default, menu selectable} option. One procedure for this that is not stupid, like editing boot grub grub.cfg is to add a menuentry to .Booting into single user mode usually means booting to runlevel . Will there be possibility the GRUB has been removed or disabled? In various Linux distributions, the traditional script used in the was first replaced by runlevels and then by states...

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GRUB is a GRand Unified Bootloader, the default bootloader in Linux. GRUB can be used to boot Linux in the single user mode. The single user mode is a restricted mode, that is used for maintenance purposes. In single user mode, the only user available is the root user, and in RHEL, no password is asked for login. The single user mode does not have any graphical interface or any networking services running. This article discusses how you can boot your system in single user mode, using GRUB.

Booting in single user mode


Restart your computer and press any key when GRUB timer is running to stop the timer before timeout.

Grub Single User


Carefully read the instructions (keystrokes) provided in the lower part of the screen. It asks to press 'e' to edit the commands before booting. So, we press 'e' now to get this screen:

Grub Edit


Here, we want to edit the kernel command. Select the second line and press...

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By default, in Solaris x86 10 1/06 the new GRUB boot loader does not provide a fully functional single user boot option in the menu that is presented upon booting. The default menu only has a GRUB “Safe Mode” boot option to choose from, but not the option to choose to boot to single user mode.

A true “Single User” boot option is key for many customers to apply patches and perform other administration needs. The below steps will show you the procedures to boot into single user mode using GRUB. The first method shows how to do this temporarily, and the other shows how to do this permanently by modifying the GRUB menu.lst file.

Temporary method : using GRUB

To boot single user mode temporarily from the GRUB menu, boot the system up and when the GRUB menu appears, type “e” for edit. You will then see a screen that will have 2 booting options as below.

NOTE: The “findroot (rootfs0,0,a)” line in the example above may look different for your...

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The above answer describes how to make a Linux/GRUB2 host/box boot to single-user mode as the permanent default option. One can also make this a permanent but {non-default, menu-selectable} option. One procedure for this (that is not stupid, like editing /boot/grub/grub.cfg) is to add a menuentry to /etc/grub.d/40_custom (but see note @ end on menu order):

1. (safety 1st!) Backup your current /etc/grub.d/40_custom . (IIUC, this is part of a default/generic GRUB2 setup.) A real filesystem backup is optimal here, but one can also just use the old backup-to-.0 idiom:

FP_TO_BACKUP='/etc/grub.d/40_custom' BACKUP_FP="${FP_TO_BACKUP}.0" sudo ls -al "${FP_TO_BACKUP}*" # checking that you don't already have one cp "${FP_TO_BACKUP}" "${BACKUP_FP}" sudo chmod a-wx "${BACKUP_FP}" # non-executable files not used by GRUB2

2. In your editor of choice, open your current /boot/grub/grub.cfg and /etc/grub.d/40_custom. In Emacs with TRAMP, you can do this from a normal session...

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EDIT: Since posting this, I have noticed that I can boot openSUSE just fine when I insert the installation DVD, select "Boot From Hard Disk" and then boot the system. I do not know why.

I have a Toshiba Satellite C55-B5353 with Linux openSUSE Tumbleweed. I recently noticed a problem with the GRUB2 boot loader that is affecting my system's ability to start.
When attempting to start the system, I typically encounter one of these errors:

Upon selecting "openSUSE Tumbleweed" from the boot menu, GRUB hangs after displaying the Loading Initial Ramdisk ... message. Instead of booting into the kernel, GRUB simply freezes, requiring me to forcibly shut down the system. GRUB does not boot at all, instead freezing on the Toshiba splash screen.

When booting the kernel's rescue mode, the system sometimes boots, but more often, it hangs after going through the usual startup messages, and does not load the command prompt nor KDE. This problem sometimes occurs with single-user...

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i do not have 11.3 now but 11.4.1. procedure in sol14662 seems correct here. doesn't it really work on yours?

sol14662: Restarting the BIG-IP system in single-user mode (GRUB2)

GNU GRUB version 2.00~beta4 **************************************************************************** * setparams 'BIG-IP 11.4.1 Build 637.0 ' * * * * set root='(lvm/vg--db--sda-dat.boot)' * * linux /boot/92/vmlinuz ro root=UUID=8f6a76b7-9fd6-4403-b591-6b1\ * * 2d3339b1e console=ttyS0 panic=1 platform=C109 quiet * * initrd /boot/92/initrd * * # TIC_IMAGE_INDEX: 92 * * # TIC_VS_PRODUCT: BIG-IP * * # TIC_VS_VERSION: 11.4.1 * * # TIC_VS_BUILD: 637.0 * * # TIC_VS_BASEBUILD: 608.0 * * ...
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menuentry 'openSUSE 12.3' --class 'opensuse-12-3' --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-fc6720c3-8404-47a9-b3e7-d310613a11d1' { load_video set gfxpayload=keep insmod gzio insmod part_msdos insmod ext2 set root='hd0,msdos1' if [ x$feature_platform_search_hint = xy ]; then search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1' e6ad9c57-3ca5-44ff-85a0-df895dd558ac else search --no-floppy --fs-uuid --set=root e6ad9c57-3ca5-44ff-85a0-df895dd558ac fi echo 'Loading Linux 3.7.10-1.4-desktop ...' linux /vmlinuz-3.7.10-1.4-desktop root=UUID=fc6720c3-8404-47a9-b3e7-d310613a11d1 resume=/dev/disk/by-label/SWAP splash=silent quiet showopts echo 'Loading initial ramdisk ...' initrd /initrd-3.7.10-1.4-desktop...
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You can set a password for the GRUB bootloader. This prevents users from entering single user mode or changing settings at boot time.

When your system is rebooted, grub presents the boot option menu. From this menu one can easily login into a single user mode without the password which might result into compromise system security.

For example, anyone can access the data or change the settings. However you can setup a password for grub with password option. This option forces grub to ask for a password before making any changes or entering into single user mode. You need to type p followed by password.

#1: Create A Password For Grub

Type grub-md5-crypt command to create password in MD5 format:
# grub-md5-cryptOutput:

Password: Retype password: $1$NYoR71$Sgv6pxQ6LG4GXpfihIJyL0

Please note that you need to copy and paste the MD5 password ($1$NYoR71$Sgv6pxQ6LG4GXpfihIJyL0) to your configuration file. Use mouse to copy the same.

#2 Add...

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