Solution to “error: invalid environment block” when Ubuntu starts up

1. Error status 2. Solution

1. Error status

When starting Ubuntu with grub, some errors are displayed below:

error: invalid environment block

Press any key to continue...

2. Solutions

Execute the following instructions:

sudo cd /boot/grub
sudo rm grubenv
sudo grub-editenv grubenv create
sudo grub-editenv grubenv set default=0

Now check whether it is feasible

grub-editenv grubenv list
# default=0

Restart again should have no problem.

thank you