[Bug 1761336] [NEW] Drops to grub> prompt in Secure Boot Mode

[setchi]

Public bug reported:

I've Ubuntu installed with Windows 10 in dual-boot. When I run the PC or when I restart it this happens:
1. I see the motherload screen.
2. A grub command line appears.
3. I type 'exit' to halt it.
4. The motherload screen appears again.
5. Finally the grub where I can select the OS shows up and all runs properly.

** Affects: grub2 (Ubuntu)
     Importance: Low
         Status: Confirmed

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https://bugs.launchpad.net/bugs/1761336

Title:
  Drops to grub> prompt in Secure Boot Mode

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  I've Ubuntu installed with Windows 10 in dual-boot. When I run the PC or when I restart it this happens:
  1. I see the motherload screen.
  2. A grub command line appears.
  3. I type 'exit' to halt it.
  4. The motherload screen appears again.
  5. Finally the grub where I can select the OS shows up and all runs properly.

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