migration-assistant unable to unmount target -"/usr/lib/ubiquity/ubiquity/install_misc.py", line 260, in start

[Peter T Hayward]

While installing Quantal 12.10 on my iMac, overwriting Precise 12.04 on partition sda7, I got migration-assistant telling me that it couldn't unmount sda7. Using a terminal I saw that sda7 was mounted on /target, presumably used by the installer.
I could have unmounted manually, but I decided to continue installing despite possibly losing existing files on 12.04.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: ubiquity 2.10.16
ProcVersionSignature: Ubuntu 3.4.0-1.3-generic 3.4.0-rc5
Uname: Linux 3.4.0-1-generic x86_64
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
CasperVersion: 1.316
Date: Thu May 10 14:14:28 2012
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash --
LiveMediaBuild: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64+mac (20120509)
ProcEnviron:
 LANGUAGE=en_GB.UTF-8
 TERM=unknown
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Sasa Paporovic (melchiaros)]

In UbiquitySyslog.gz( archive extracted):

May 10 13:14:06 ubuntu ubiquity[4306]: Reverting lockdown of the desktop environment.
May 10 13:14:06 ubuntu ubiquity[4306]: Reverting lockdown of the desktop environment.
May 10 13:14:06 ubuntu plugininstall.py: log-output -t ubiquity chroot /target mount -t proc proc /proc
May 10 13:14:06 ubuntu plugininstall.py: log-output -t ubiquity chroot /target mount -t sysfs sysfs /sys
May 10 13:14:06 ubuntu plugininstall.py: log-output -t ubiquity mount --bind /dev /target/dev
May 10 13:14:07 ubuntu ubiquity: Error in function start
May 10 13:14:07 ubuntu plugininstall.py: Exception during installation:
May 10 13:14:07 ubuntu plugininstall.py: Traceback (most recent call last):
May 10 13:14:07 ubuntu plugininstall.py: File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 260, in start
May 10 13:14:07 ubuntu plugininstall.py: self.db.progress('START', 0, 100, self.title)
May 10 13:14:07 ubuntu plugininstall.py: File "/usr/lib/python2.7/dist-packages/debconf.py", line 62, in <lambda>
May 10 13:14:07 ubuntu plugininstall.py: lambda *args, **kw: self.command(command, *args, **kw))
May 10 13:14:07 ubuntu plugininstall.py: File "/usr/lib/python2.7/dist-packages/debconf.py", line 83, in command
May 10 13:14:07 ubuntu plugininstall.py: status = int(status)
May 10 13:14:07 ubuntu plugininstall.py: ValueError: invalid literal for int() with base 10: ''
May 10 13:14:07 ubuntu plugininstall.py:
May 10 13:14:27 ubuntu ubiquity:

[Sasa Paporovic (melchiaros)]

Sorry for the delay Peter,

many bugs arround.

In moment the ubiquity(the installer) is in versionn 2.11.30 available:

http://cdimage.ubuntu.com/daily-live/current/

Your report depends on ubiquity 2.10.16, so there is a big gab.

This is not necessary, but nlwould be helpfull when you can do a retest for us.

Thank you for your report

melchiaros

When the problem is fixed please set the status of the report to Fix Released, when not leave a message here and let it on confirmed.

[Marcus Tomlinson (marcustomlinson)]

This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue on a maintained version of Ubuntu please let us know.

[Launchpad Janitor (janitor)]

[Expired for ubiquity (Ubuntu) because there has been no activity for 60 days.]