Ubiquity Installer Crashes on Mac Book Air 5,2 with 12.10 beta 1 USB - "/usr/share/ubiquity/plugininstall.py", line 1724, in <module> install.run()

[nantes]

After majority of installation is finished, fails to install grub on 'target'.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: ubiquity 2.11.30 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 3.5.0-13.14-generic 3.5.3
Uname: Linux 3.5.0-13-generic x86_64
ApportVersion: 2.5.1-0ubuntu4
Architecture: amd64
CasperVersion: 1.321
Date: Sun Sep 9 14:42:16 2012
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash --
LiveMediaBuild: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120905.2)
ProcEnviron:
 TERM=unknown
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[nantes (jnovinger)]

Booted from USB thumb drive, via ReFit bootloader inside of Mac OS X 10.8.

Of note, had to kill 'grub-mount' to progress past Timezone selection step (accompanies syslog entries at around 19:34 in the attached syslog):

root 18114 0.0 0.0 28536 1272 ? Ss 14:33 0:00 grub-mount /dev/sdb1 /var/lib/os-prober/mount

[Sasa Paporovic (melchiaros)]

In UbiquitySyslog.txt:

Sep 9 19:41:21 ubuntu ubiquity: W: Duplicate sources.list entry cdrom://Ubuntu 12.10 _Quantal Quetzal_ - Alpha amd64 (20120905.2)/ quantal/main i386 Packages (/var/lib/apt/lists/Ubuntu%2012.10%20%5fQuantal%20Quetzal%5f%20-%20Alpha%20amd64%20(20120905.2)_dists_quantal_main_binary-i386_Packages)
Sep 9 19:41:21 ubuntu ubiquity: W: Duplicate sources.list entry cdrom://Ubuntu 12.10 _Quantal Quetzal_ - Alpha amd64 (20120905.2)/ quantal/restricted i386 Packages (/var/lib/apt/lists/Ubuntu%2012.10%20%5fQuantal%20Quetzal%5f%20-%20Alpha%20amd64%20(20120905.2)_dists_quantal_restricted_binary-i386_Packages)
Sep 9 19:41:21 ubuntu ubiquity: W: You may want to run apt-get update to correct these problems
Sep 9 19:41:21 ubuntu ubiquity: E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
Sep 9 19:41:21 ubuntu grub-installer: info: Calling 'apt-install grub-efi' failed
Sep 9 19:42:11 ubuntu ubiquity[3822]: Reverting lockdown of the desktop environment.
Sep 9 19:42:11 ubuntu activate-dmraid: No Serial ATA RAID disks detected
Sep 9 19:42:11 ubuntu plugininstall.py: log-output -t ubiquity umount /target/cdrom
Sep 9 19:42:11 ubuntu finish-install: Disabling CD in sources.list
Sep 9 19:42:11 ubuntu plugininstall.py: Exception during installation:
Sep 9 19:42:11 ubuntu plugininstall.py: Traceback (most recent call last):
Sep 9 19:42:11 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1724, in <module>
Sep 9 19:42:11 ubuntu plugininstall.py: install.run()
Sep 9 19:42:11 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 81, in wrapper
Sep 9 19:42:11 ubuntu plugininstall.py: func(self)
Sep 9 19:42:11 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 229, in run
Sep 9 19:42:11 ubuntu plugininstall.py: self.configure_bootloader()
Sep 9 19:42:11 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1013, in configure_bootloader
Sep 9 19:42:11 ubuntu plugininstall.py: "GrubInstaller failed with code %d" % ret)
Sep 9 19:42:11 ubuntu plugininstall.py: ubiquity.install_misc.InstallStepError: GrubInstaller failed with code 1
Sep 9 19:42:11 ubuntu plugininstall.py:
Sep 9 19:42:12 ubuntu partman: No matching physical volumes found
Sep 9 19:42:12 ubuntu partman: Reading all physical volumes. This may take a while...
Sep 9 19:42:12 ubuntu partman: No volume groups found
Sep 9 19:42:12 ubuntu partman-lvm: No volume groups found
Sep 9 19:42:14 ubuntu kernel: [ 1687.664372] EXT4-fs (sda4): mounted filesystem with ordered data mode. Opts: (null)
Sep 9 19:42:14 ubuntu ubiquity: umount: /tmp/tmp.rL07yc3yXu: not mounted
Sep 9 19:42:15 ubuntu kernel: [ 1687.914326] EXT4-fs (sda4): mounted filesystem with ordered data mode. Opts: (null)
Sep 9 19:42:15 ubuntu ubiquity: umount: /tmp/tmp.BwtpegFxJD: not mounted
Sep 9 19:42:16 ubuntu kernel: [ 1689.174094] EXT4-fs (sda4): mounted filesystem with ordered data mode. Opts: (null)
Sep 9 19:42:16 ubuntu ubiquity: umount: /tmp/tmp.bPyVm4eDBY: not mounted
Sep 9 19:42:16 ubuntu kernel: [ 1689.412236] EXT4-fs (sda4): mounted filesystem...