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
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: grub-installer (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1762533
"Work-around":
1. Boot to another OS on the computer
2. sudo mv /target/@/* /target
3. sudo update-grub2
This results in a workable OS.
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https://bugs.launchpad.net/bugs/1762533
Title: