Tried to start an upgrade using Synaptic.

[Peter Trenholme]

Running inside a Fedora virtual machine.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: ubuntu-release-upgrader-core 1:0.190.6
ProcVersionSignature: Ubuntu 3.5.0-27.46-generic 3.5.7.7
Uname: Linux 3.5.0-27-generic x86_64
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
Date: Thu May 23 17:03:33 2013
InstallationDate: Installed on 2012-12-10 (164 days ago)
InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=
 TERM=unknown
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to quantal on 2013-05-24 (0 days ago)
VarLogDistupgradeTermlog:

[Sasa Paporovic (melchiaros)]

In Mainlog:

2013-05-23 17:02:52,984 ERROR html widget
Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-9rp91e/DistUpgrade/DistUpgradeViewGtk3.py", line 437, in __init__
    from gi.repository import WebKit
ImportError: cannot import name WebKit

[Sasa Paporovic (melchiaros)]

In Mainlog:

2013-05-23 17:03:16,740 DEBUG failed to lock the cache, retrying (18)
2013-05-23 17:03:17,323 ERROR openCache() failed: 'E:Could not open file /var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_quantal-backports_main_i18n_Translation-en - open (24: Too many open files), E:Could not open file /var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_quantal-backports_universe_binary-i386_Packages - open (24: Too

.
..
...
2013-05-23 17:03:17,323 ERROR self.prepared() failed

[Sasa Paporovic (melchiaros)]

Thank you for reporting.

This issue is known and your report will be marked as dublicate of the original report.