Update grub uuid

The grub2-editenv utility is actually the recommended path to alter these variables. As a result, the following can be used. Appending an extra argument:. Here copy paste the content from above command and append the additional kernel parameter you wish to add to the GRUB2. Similarly to remove a parameter or argument from kernel command line in GRUB2, use the below syntax. Active Oldest Votes. Improve this answer. Thomas Thomas 4, 5 5 gold badges 20 20 silver badges 28 28 bronze badges.

Looks good. I will give it a try. Can you Link your answer to a source for that Info? Sorry, don't get your question? I tried, but the config still searches for UUIDs, but it also appended other search options. I need to clone the VM to test it Could you precise a bit what you have done and which config I updated my Q with further details - if you can solve this too, I will accept your answer. Add a comment. Active Oldest Votes.

Improve this answer. Thank you! This finally worked after switching drives. Hacked version of script I obviously haven't tested this but you could hack the script and create your own version run after booting from HDD. Place these commands in the hacked script:! Community Bot 1. I did not try yours, as the other one has fixed it. Thank you all the same. I'll leave the answer here just in case it's helpful to others. The other answer is good and I'm glad it worked.

I've upvoted both your question and the other answer because it could help other Clonezilla users. Hope this helps someone else who isn't getting an entry in their BIOS menu. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. In addition, the arrow , Home , End , and Delete keys work as they do in the bash shell. Rescue mode provides a convenient single-user environment and allows you to repair your system in situations when it is unable to complete a normal booting process.

In rescue mode, the system attempts to mount all local file systems and start some important system services, but it does not activate network interfaces or allow more users to be logged into the system at the same time.

In Red Hat Enterprise Linux 7, rescue mode is equivalent to single user mode and requires the root password. Note that equivalent parameters, 1 , s , and single , can be passed to the kernel as well. Emergency mode provides the most minimal environment possible and allows you to repair your system even in situations when the system is unable to enter rescue mode.

In emergency mode, the system mounts the root file system only for reading, does not attempt to mount any other local file systems, does not activate network interfaces, and only starts few essential services.

In Red Hat Enterprise Linux 7, emergency mode requires the root password. Note that equivalent parameters, emergency and -b , can be passed to the kernel as well.

The systemd debug shell provides a shell very early in the startup process that can be used to diagnose systemd related boot-up problems. Once in the debug shell, systemctl commands such as systemctl list-jobs , and systemctl list-units can be used to look for the cause of boot problems. In addition, the debug option can be added to the kernel command line to increase the number of log messages. For systemd , the kernel command-line option debug is now a shortcut for systemd.

If required, the debug shell can be set to start on every boot by enabling it with the systemctl enable debug-shell command. Alternatively, the grubby tool can be used to make persistent changes to the kernel command line in the GRUB 2 menu. See Section Permanently enabling the debug shell is a security risk because no authentication is required to use it. Disable it when the debugging session has ended. During the boot process, the systemd-debug-generator will configure the debug shell on TTY9.

If required, to verify you are in the debug shell, enter a command as follows:. To diagnose start up problems, certain systemd units can be masked by adding systemd. To start additional processes during the boot process, add systemd. The systemd-debug-generator 8 manual page describes these options. Setting up the root password is a mandatory part of the Red Hat Enterprise Linux 7 installation.

If you forget or lose the root password it is possible to reset it, however users who are members of the wheel group can change the root password as follows:. The root password is now required to operate in single-user mode as well as in emergency mode.

Two procedures for resetting the root password are shown here:. Remove the autorelable file to prevent a time consuming SELinux relabel of the disk:.

Remove the rhgb and quiet parameters from the end, or near the end, of the linux16 line, or linuxefi on UEFI systems. The rhgb and quiet parameters must be removed in order to enable system messages. The initramfs will stop before passing control to the Linux kernel , enabling you to work with the root file system. Note that the initramfs prompt will appear on the last console specified on the Linux line. With an encrypted file system, a password is required at this point. However the password prompt might not appear as it is obscured by logging messages.

You can press the Backspace key to see the prompt. Release the key and enter the password for the encrypted file system, while ignoring the logging messages. You will not be allowed to change the password if the file system is not writable.

Enter the passwd command and follow the instructions displayed on the command line to change the root password. Note that if the system is not writable, the passwd tool fails with the following error:. Updating the password file results in a file with the incorrect SELinux security context. To relabel all files on next system boot, enter the following command:. Enter the exit command again to resume the initialization and finish the system boot. With an encrypted file system, a pass word or phrase is required at this point.

You can press and hold the Backspace key to see the prompt. Note that the SELinux relabeling process can take a long time. A system reboot will occur automatically when the process is complete. Enter the following commands to turn SELinux policy enforcement back on and verify that it is on:. The Unified Extensible Firmware Interface UEFI Secure Boot technology ensures that the system firmware checks whether the system boot loader is signed with a cryptographic key authorized by a database of public keys contained in the firmware.

With signature verification in the next-stage boot loader and kernel, it is possible to prevent the execution of kernel space code which has not been signed by a trusted key. A chain of trust is established from the firmware to the signed drivers and kernel modules as follows. The first-stage boot loader, shim. The shim. The kernel in turn contains public keys to authenticate drivers and modules.

The specification defines:.