[Bug 997628] Re: migration-assistant unable to unmount target

[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: 

** Summary changed:

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

** Changed in: ubiquity (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/997628

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

Status in “ubiquity” package in Ubuntu:
  Confirmed

Bug description:
  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)

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