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
** Information type changed from Private Security to Public
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https://bugs.launchpad.net/bugs/1694618
Title:
grub-efi-amd64-signed failed installation /target/ Ubuntu 16.04
To manage