I could have sworn there was already a bug about the poorly worded
message, but can't find it now, so I'll reassign this one.
** Package changed: grub-installer (Ubuntu) => partman-efi (Ubuntu)
** Changed in: partman-efi (Ubuntu)
Importance: Undecided => Medium
** Changed in: partman-efi (Ub
Actually, the disk was completely blank when I started. I wanted to have
a btrfs partition instead of a ext4 partition, so I chose to set it up
manually.
I don't think the bug is invalid, because there are two problems with
the EFI warning message:
1. Go back didn't work when I clicked on it. So
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
