The first paste shows that your system was installed in UEFI mode.  If
your system was not in a state that would boot from UEFI (you mention
switching it from legacy to uefi after the boot failure), this could
explain the failure.

The boot-repair tool is not part of Ubuntu, so I can't account for any
changes it made to the system configuration when running.  What would be
useful for debugging is:

  - the output of 'efibootmgr -v' run from the installer immediately after 
finishing installation but before rebooting
  - the output of 'efibootmgr -v' run from the USB stick after a failed boot 
from the disk

** Changed in: shim (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1487521

Title:
  "No boot device found" on Dell E7250 laptop after clean install with
  encryption

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