I experienced the same issue, albeit without the complication of a
second drive containing another O/S. My workaround was to perform an
install without WiFi connectivity and then after completing the install
perform the necessary updates and third party driver modifications. The
installation
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: grub-installer (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1875911
** Summary changed:
- ubuntu 20 failed install on Dell Precision 5510 Windows 10
+ ubuntu 20 failed install on Dell Precision 5510 Windows 10 - grub-install:
error: failed to register the EFI boot entry: Invalid argument.
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