force update 14.04 to 16.04 with LiveCD error

[公输目]

Upgrade by LiveCD form 14.04 to 16.04, Why I need type new user name, it's upgrade, so i click cancel.

but I can't login in my 14.04, (initramfs)

so I using live cd, force install not format mount `/ to /` and `home to home`, then get this error.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CasperVersion: 1.376
Date: Sat Apr 23 08:25:30 2016
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[公输目 (yue937)]

I saw the UEFI warming. that's all.

[Phillip Susi (psusi)]

You are trying to install in EFI mode to a disk that is not partitioned for it, and chose to ignore the warning suggesting a bios mode install.