This error is caused by a segfault of dpkg. This is the only occurrence
of this bug I found. Could you please run a memory test on your system
and try the installation again.

If it happens again, please check if there is a crash file in /var/crash/ and 
upload it to launchpad with the command:
ubuntu-bug /var/crash/<name of the crash>.crash

Thanks.

** Package changed: grub-installer (Ubuntu) => dpkg (Ubuntu)

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

** Changed in: dpkg (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1871187

Title:
  Installation of Ubuntu 20.04 finished successfully except for grub

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