Root account is locked

After a software update I have the same issue ‘root account is locked’.
I tried to follow the instructions in the link: section ’ Restoring the bootloader using the Live disk’
But have the error below:

Where can I find information on resolving this? Any help anyone?

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List your block devices and post the output:

lsblk -o +FSTYPE,UUID

You can also use an alternative way to reset root password:

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