Bricked GRUB after boot-repair

Bricked GRUB after boot-repair

 
Dear all,

I’m running Ubuntu 18.04LTS since a while next to my windows 10. Out of the blue, GRUB did not seem to boot into my Ubuntu anymore; it got stuck in GRUB’s command-line interface (it seems more people had this problem over the past days). It was still possible to boot using the sequence:

set prefix=(hd0,gpt5)/boot/grub
set root=(hd0,gpt5)
insmod linux
insmod normal
normal

Yet, running sudo update-grub after booting did not fix the issue. I then decided to use boot-repair to try to fix the problem, and followed the instructions of https://help.ubuntu.com/community/Boot-Repair using a bootable stick. This was not successful; boot-repair threw an error with the message: locked-nvram detected. At this point I’m even unable to boot into Ubuntu using the sequence above. Before I’m trying other stuff and really mess up my system beyond repair I’d like your input on my situation. Pastebin is available on: https://paste.ubuntu.com/p/Ddq6jCfq2t/

What would be the best way to proceed from here?

 

Previous [server] Netplan headache?
Next [ubuntu] Newbie: 20.04 LTS Wifi drops
 

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