[Bug 1872736] Re: install from USB to USB device wipes grub setup on NVME disk

[Oliver Grawert]

Note that the install to USB seems to have done what it should just fine
...

...but that it wiped existing the bootloader on the internal disk that
was explicitly de-selected everywhere is not okay.

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https://bugs.launchpad.net/bugs/1872736

Title:
  install from USB to USB device wipes grub setup on NVME disk

Status in ubiquity package in Ubuntu:
  New

Bug description:
  For a system test I prepared a USB stick with the current focal iso,
  booted from it and attempted an install to another (identical) USB
  disk.

  During partitioning /dev/sdb (the USB disk) was picked as target for the bootloader installation, 
  a 63GB ext4 partition for / and a 1GB swap partition were created. 

  The install went flawless.

  After finishing my testing I removed all USB keys and rebooted to find
  out i am now greeted with a grub input prompt and have no way to boot
  off the internal NVME disk anymore...

  Plugging in the target USB stick that was used to install focal to
  gives me a proper grub menu allowing me to select to boot the NVME
  installation. So i can only boot with plugged in USB now, without it i
  end up at a grub input prompt ...

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