Comment 3 for bug 1047550

In Syslog:

Sep 7 18:19:16 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 7 18:19:16 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 7 18:19:16 ubuntu ubiquity: W: Du kan muligvis rette problemet ved at køre 'apt-get update'
Sep 7 18:19:16 ubuntu ubiquity: E: Kunne ikke hente nogle af arkiverne. Prøv evt. at køre 'apt-get update' eller prøv med --fix-missing.
Sep 7 18:19:16 ubuntu grub-installer: info: Calling 'apt-install grub-efi' failed
Sep 7 18:19:26 ubuntu ubiquity[4714]: Reverting lockdown of the desktop environment.
Sep 7 18:19:26 ubuntu activate-dmraid: No Serial ATA RAID disks detected
Sep 7 18:19:26 ubuntu plugininstall.py: log-output -t ubiquity umount /target/cdrom
Sep 7 18:19:26 ubuntu finish-install: Disabling CD in sources.list
Sep 7 18:19:26 ubuntu plugininstall.py: Exception during installation:
Sep 7 18:19:26 ubuntu plugininstall.py: Traceback (most recent call last):
Sep 7 18:19:26 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1724, in <module>
Sep 7 18:19:26 ubuntu plugininstall.py: install.run()
Sep 7 18:19:26 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 81, in wrapper
Sep 7 18:19:26 ubuntu plugininstall.py: func(self)
Sep 7 18:19:26 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 229, in run
Sep 7 18:19:26 ubuntu plugininstall.py: self.configure_bootloader()
Sep 7 18:19:26 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1013, in configure_bootloader
Sep 7 18:19:26 ubuntu plugininstall.py: "GrubInstaller failed with code %d" % ret)
Sep 7 18:19:26 ubuntu plugininstall.py: ubiquity.install_misc.InstallStepError: GrubInstaller failed with code 1
Sep 7 18:19:26 ubuntu plugininstall.py:
Sep 7 18:19:26 ubuntu ubiquity: umount: /target: device is busy.
Sep 7 18:19:26 ubuntu ubiquity: (In some cases useful info about processes that use
Sep 7 18:19:26 ubuntu ubiquity: the device is found by lsof(8) or fuser(1))
Sep 7 18:19:26 ubuntu ubiquity[4714]: debconffilter_done: ubi-partman (current: ubi-partman)
Sep 7 18:19:26 ubuntu ubiquity[4714]: Reverting lockdown of the desktop environment.
Sep 7 18:19:45 ubuntu ubiquity:
Sep 7 18:19:45 ubuntu ubiquity: (apport-gtk:1303): Gtk-WARNING **: Locale not supported by C library.
Sep 7 18:19:45 ubuntu ubiquity: #011Using the fallback 'C' locale.