yes my partition scheme was the problem.
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https://bugs.launchpad.net/bugs/1641330
Title:
UEFI install failing on 16.04 Dell Precision m3800
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Your disk is currently partitioned to boot in bios mode, but you booted
the 16.04 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 par
