Your disk is currently partitioned to boot in bios mode, but you booted
the installer in EFI mode. A warning message prompted you that this
could be a problem and recommended performing a bios mode install
instead, but you chose not to. You either need to perform the bios mode
install, or partition
Was this a fresh install or via dist-upgrade?
This line in your Syslog got my attention: Mar 13 21:20:19 ubuntu
ubiquity: grub-install: error: cannot find EFI directory.
Can you confirm if you have an EFI directory in your disk partition?
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