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How do you fix an invalid environment block?
Press E at the GRUB menu. Find the line saying save_env recordfail and delete all of it with the Del or Backspace key. Press Ctrl + X to boot, and then open the Terminal by searching it in the dash(launcher menu). Run the following command, and then when it asks for your password, type it, and press Enter .
What is Grubenv file?
The environment block is a preallocated 1024-byte file, which normally lives in /boot/grub/grubenv (although you should not assume this). At boot time, the load_env command (see load_env) loads environment variables from it, and the save_env (see save_env) command saves environment variables to it.
How do I open grub menu in Ubuntu?
With BIOS, quickly press and hold the Shift key, which will bring up the GNU GRUB menu. (If you see the Ubuntu logo, you’ve missed the point where you can enter the GRUB menu.) With UEFI press (perhaps several times) the Escape key to get grub menu. Select the line which starts with “Advanced options”.
What causes Grub to fail in the Environment Block?
Perhaps your distribution sets up GRUB in such a way that some essential setting is stored in the environment block, and the problem in the environment block also causes the boot to fail. Or perhaps it’s caused by something different, like BIOS detecting the disks in a different order than expected by the grub-install program.
Where do I find the GRUB2 error message?
The error message might refer to GRUB2 environment block, located usually in /boot/grub/grubenv. It should contain readable text, so have a look at it. Hanging on black screen might be caused by many things.
How can I edit the Environment Block in Grub?
From a running system, the grub-editenv utility can be used to edit the environment block. For safety reasons, this storage is only available when installed on a plain disk (no LVM or RAID), using a non-checksumming filesystem (no ZFS), and using BIOS or EFI functions (no ATA, USB or IEEE1275).
Why does Grub hang on a black screen?
Hanging on black screen might be caused by many things. Perhaps your distribution sets up GRUB in such a way that some essential setting is stored in the environment block, and the problem in the environment block also causes the boot to fail.