The error in your logs is:
Nov 9 19:25:47 ubuntu ubiquity: grub-install: warning: Cannot set EFI variable
Boot0000.
Nov 9 19:25:47 ubuntu ubiquity: grub-install: warning: efivarfs_set_variable:
writing to fd 7 failed: Invalid argument.
Nov 9 19:25:47 ubuntu ubiquity: grub-install: warning: _efi_set_variable_mode:
ops->set_variable() failed: Invalid argument.
Nov 9 19:25:47 ubuntu ubiquity: grub-install: error: failed to register the
EFI boot entry: Invalid argument.
Do you know of a reason that Ubuntu would be unable to write to these
firmware variables, such as a BIOS security setting?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1851955
Title:
ubuntu 19.10 boot installer failed
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