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
#see https://bugs.launchpad.net/ubuntu/+source/grub-
installer/+bug/1629348
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https://bugs.launchpad.net/bugs/1709306
Title:
Xubuntu installer with usb in UEFI BIOS mode ubiquity GRUB
