Thank you for your bug report, could you give some details on the
machine you are using (vendor, model, ...)? It could be a firmware
problem, could you check if any update is available?

** Summary changed:

- Grub-amd64-signed error
+ Could not prepare Boot variable: Invalid argument

** Changed in: grub-installer (Ubuntu)
   Importance: Undecided => Low

** Changed in: grub-installer (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1834858

Title:
  Could not prepare Boot variable: Invalid argument

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