update-manager crashed with AptDaemonError in _convert_dbus_exception(): org.debian.apt: Could not cancel transaction

[Chirag Patel]

Current system:

Description: Ubuntu precise (development branch)
Release: 12.04

I am trying to update from update manager and it fails with this errors:

update-manager:
  Installed: 1:0.156.11
  Candidate: 1:0.156.14
  Version table:
     1:0.156.14 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/main i386 Packages
 *** 1:0.156.11 0
        100 /var/lib/dpkg/status
0

Other message popup window:

CD/DVD 'Ubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)' is required

Please insert the above CD/DVD into the drive '/cdrom/' to install software packages from it.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.11
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic-pae 3.2.14
Uname: Linux 3.2.0-23-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu3
Architecture: i386
CrashCounter: 1
Date: Fri Apr 27 21:58:00 2012
ExecutablePath: /usr/bin/update-manager
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1335589053
 com.ubuntu.update-manager show-details true
 com.ubuntu.update-manager window-height 610
 com.ubuntu.update-manager window-width 600
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/update-manager
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=en_US.UTF-8
PythonArgs: ['/usr/bin/update-manager']
SourcePackage: update-manager
Title: update-manager crashed with AptDaemonError in _convert_dbus_exception(): org.debian.apt: Could not cancel transaction
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Robert Roth (evfool)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. We appreciate the difficulties you are facing, but this appears to be a "regular" (non-security) bug. I have unmarked it as a security issue since this bug does not show evidence of allowing attackers to cross privilege boundaries nor directly cause loss of data/privacy. Please feel free to report any other bugs you may find.

[Robert Roth (evfool)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug #976889, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.

[ggallozz (ggallozz-gmail)]

Just disable CD sources in /etc/apt/sources.list or via Synaptic menu /Settings /Repositories [Other Software]

[Bill Wayson (bwayson)]

I just finished installing the released version of Ubuntu 12.04 amd64 on a laptop/tablet, and I received the second message given by the reporter after the first reboot and when attempting the first application of updates using Update Manager:

CD/DVD 'Ubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)' is required

Please insert the above CD/DVD into the drive '/cdrom/' to install software packages from it.

Other than this message, I am not sure I have the same problem as the reporter does. The Ubuntu Crash Reporter did say that my issue was a duplicate of this one.

The installation was done using an external USB DVD/CD drive.

The suggestion in message #4 did not work for me even after multiple refreshes of available updates and a reboot. I believe it did not work because the Update Manager -> Settings... -> Other Software window showed two entries for Cdrom with Ubuntu 12.04 'Precise Pangolin'. I unchecked both lines and closed the dialog. But, when I investigated /etc/apt/sources.list, there were three lines for the cdrom, and only two were commented out. I commented out the third line, saved the file, and then could proceed with Update Manager with no problem.