bootloader failed to install

install fails at bootloader install

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: ubiquity 2.15.26
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
ApportVersion: 2.12.5-0ubuntu2
Architecture: amd64
CasperVersion: 1.336ubuntu1
Date: Fri Nov 22 15:15:35 2013
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper cdrom-detect/try-usb=true noprompt floppy.allowed_drive_mask=0 ignore_uuid initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
LiveMediaBuild: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MarkForUpload: True
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
SourcePackage: grub-installer
UbiquityDebug:
 Ubiquity 2.15.26

 (ubiquity:2446): IBUS-WARNING **: The owner of /home/ubuntu/.config/ibus/bus is not root!
 update_release_notes_label()
 update_release_notes_label()
UpgradeStatus: No upgrade log present (probably fresh install)