the main.log content is :
2010-05-06 10:25:34,575 INFO Using config files '['./DistUpgrade.cfg']'
2010-05-06 10:25:34,576 INFO uname information: 'Linux morgand-acer 2.6.31-21-generic #59-Ubuntu SMP Wed Mar 24 07:28:27 UTC 2010 x86_64'
2010-05-06 10:25:34,576 INFO creating state file with '['tar', '-z', '-c', '-f', '/var/log/dist-upgrade/system_state.tar.gz', '/etc/apt/preferences.d/', '/etc/apt/sources.list', '/etc/apt/sources.list.d/', '/var/lib/dpkg/status']'
2010-05-06 10:25:34,767 INFO release-upgrader version '0.134.7' started
2010-05-06 10:25:34,961 DEBUG svg pixbuf loader failed (Error displaying image)
2010-05-06 10:25:35,091 DEBUG Using 'DistUpgradeViewGtk' view
2010-05-06 10:25:35,128 DEBUG aufsOptionsAndEnvironmentSetup()
2010-05-06 10:25:35,128 DEBUG using '/tmp/upgrade-rw-y20i1g' as aufs_rw_dir
2010-05-06 10:25:35,129 DEBUG using '/tmp/upgrade-chroot-jGEkkI' as aufs chroot dir
2010-05-06 10:25:35,129 DEBUG enable dpkg --force-overwrite
2010-05-06 10:25:35,319 DEBUG lsb-release: 'karmic'
2010-05-06 10:25:35,325 DEBUG who -m --ips: ''
2010-05-06 10:25:35,326 DEBUG _pythonSymlinkCheck run
2010-05-06 10:25:35,326 DEBUG openCache()
2010-05-06 10:25:36,707 DEBUG /openCache(), new cache size 28849
2010-05-06 10:25:36,718 DEBUG needServerMode(): run in 'desktop' mode, (because of pkg 'ubuntu-desktop')
2010-05-06 10:25:36,718 DEBUG checkViewDepends()
2010-05-06 10:25:36,719 DEBUG running doUpdate() (showErrors=False)
2010-05-06 10:25:37,000 WARNING updateStatus: dlFailed on 'http://security.ubuntu.com/ubuntu/dists/karmic-security/universe/i18n/Translation-fr.bz2' 
2010-05-06 10:25:37,139 WARNING updateStatus: dlFailed on 'http://security.ubuntu.com/ubuntu/dists/karmic-security/main/i18n/Translation-fr.bz2' 
2010-05-06 10:25:37,140 WARNING updateStatus: dlFailed on 'http://security.ubuntu.com/ubuntu/dists/karmic-security/multiverse/i18n/Translation-fr.bz2' 
2010-05-06 10:25:37,140 WARNING updateStatus: dlFailed on 'http://security.ubuntu.com/ubuntu/dists/karmic-security/restricted/i18n/Translation-fr.bz2' 
2010-05-06 10:25:37,189 WARNING updateStatus: dlFailed on 'http://archive.ubuntu.com/ubuntu/dists/karmic-updates/universe/i18n/Translation-fr.bz2' 
2010-05-06 10:25:37,200 WARNING updateStatus: dlFailed on 'http://archive.ubuntu.com/ubuntu/dists/karmic-updates/main/i18n/Translation-fr.bz2' 
2010-05-06 10:25:37,200 WARNING updateStatus: dlFailed on 'http://archive.ubuntu.com/ubuntu/dists/karmic-updates/multiverse/i18n/Translation-fr.bz2' 
2010-05-06 10:25:37,200 WARNING updateStatus: dlFailed on 'http://archive.ubuntu.com/ubuntu/dists/karmic-updates/restricted/i18n/Translation-fr.bz2' 
2010-05-06 10:25:37,274 WARNING updateStatus: dlFailed on 'http://archive.ubuntu.com/ubuntu/dists/karmic-backports/universe/i18n/Translation-fr.bz2' 
2010-05-06 10:25:37,345 WARNING updateStatus: dlFailed on 'http://archive.ubuntu.com/ubuntu/dists/karmic-backports/main/i18n/Translation-fr.bz2' 
2010-05-06 10:25:37,352 WARNING updateStatus: dlFailed on 'http://archive.ubuntu.com/ubuntu/dists/karmic-backports/multiverse/i18n/Translation-fr.bz2' 
2010-05-06 10:25:37,361 WARNING updateStatus: dlFailed on 'http://archive.ubuntu.com/ubuntu/dists/karmic-backports/restricted/i18n/Translation-fr.bz2' 
2010-05-06 10:25:37,802 DEBUG openCache()
2010-05-06 10:25:38,985 DEBUG /openCache(), new cache size 28849
2010-05-06 10:25:38,985 DEBUG doPostInitialUpdate
2010-05-06 10:25:38,986 DEBUG Plugin modules in ./plugins: remove_lilo_plugin.py kdelibs4to5_plugin.py deb_plugin.py dpkg_status_plugin.py langpack_manual_plugin.py
2010-05-06 10:25:38,986 DEBUG Loading module ./plugins/remove_lilo_plugin.py
2010-05-06 10:25:39,001 DEBUG Plugins in <module 'remove_lilo_plugin' from './plugins/remove_lilo_plugin.py'>: <class 'remove_lilo_plugin.RemoveLiloPlugin'>
2010-05-06 10:25:39,001 DEBUG Loading module ./plugins/kdelibs4to5_plugin.py
2010-05-06 10:25:39,002 DEBUG Plugins in <module 'kdelibs4to5_plugin' from './plugins/kdelibs4to5_plugin.py'>: <class 'kdelibs4to5_plugin.Kdelibs4devToKdelibs5devPlugin'>
2010-05-06 10:25:39,002 DEBUG Loading module ./plugins/deb_plugin.py
2010-05-06 10:25:39,003 DEBUG Plugins in <module 'deb_plugin' from './plugins/deb_plugin.py'>: <class 'deb_plugin.DebPlugin'>
2010-05-06 10:25:39,003 DEBUG Loading module ./plugins/dpkg_status_plugin.py
2010-05-06 10:25:39,004 DEBUG Plugins in <module 'dpkg_status_plugin' from './plugins/dpkg_status_plugin.py'>: <class 'dpkg_status_plugin.DpkgStatusPlugin'>
2010-05-06 10:25:39,004 DEBUG Loading module ./plugins/langpack_manual_plugin.py
2010-05-06 10:25:39,005 DEBUG Plugins in <module 'langpack_manual_plugin' from './plugins/langpack_manual_plugin.py'>: <class 'langpack_manual_plugin.MarkLangpacksManuallyInstalledPlugin'>
2010-05-06 10:25:39,005 DEBUG plugins for condition 'PostInitialUpdate' are '[]'
2010-05-06 10:25:39,005 DEBUG plugins for condition 'lucidPostInitialUpdate' are '[]'
2010-05-06 10:25:39,006 DEBUG plugins for condition 'from_karmicPostInitialUpdate' are '[]'
2010-05-06 10:25:39,006 DEBUG quirks: running lucidPostInitialUpdate
2010-05-06 10:25:39,006 DEBUG running lucidPostInitialUpdate
2010-05-06 10:25:42,903 DEBUG Foreign: 
2010-05-06 10:25:42,904 DEBUG Obsolete: libecore-svn-05 openshot-doc libnfo libecore-file-svn-05 libevas-engines cover-thumbnailer libecore-x-svn-05 libelm-svn-05 libedje-svn-05 libevas-svn-05 libvalhalla enna mmex libvdpau1 libecore-fb-svn-05 libecore-config-svn-05 libopal3.6.6 nvidia-glx-195 libecore-job-svn-05 usplash-theme-xbmc-spinner-black usplash-theme-xbmc-spinner-black-silver libpt2.6.5-plugins libpt2.6.5 libplayer libecore-imf-svn-05 libeina-svn-05 libedbus-svn-05 openshot libecore-con-svn-05 libecore-input-svn-05 libevas-engines-extras xbmc-standalone xbmc-data xbmc-bin nvidia-195-modaliases usplash-theme-xbmc-pulsating-logo libefreet-svn-05 libecore-ipc-svn-05 libecore-evas-svn-05 nvidia-190-modaliases python-mlt flashplugin64-installer usplash-theme-xbmc-spinner-blue xbmc-web-pm3 nvidia-195-kernel-source xbmc-skin-confluence xbmc libecore-txt-svn-05
2010-05-06 10:25:42,904 DEBUG updateSourcesList()
2010-05-06 10:25:42,963 DEBUG rewriteSourcesList()
2010-05-06 10:25:42,965 DEBUG examining: 'deb http://archive.ubuntu.com/ubuntu/ karmic main universe restricted multiverse'
2010-05-06 10:25:42,965 DEBUG entry 'deb http://archive.ubuntu.com/ubuntu/ lucid main universe restricted multiverse' updated to new dist
2010-05-06 10:25:42,965 DEBUG examining: 'deb http://security.ubuntu.com/ubuntu/ karmic-security universe main multiverse restricted'
2010-05-06 10:25:42,965 DEBUG entry 'deb http://security.ubuntu.com/ubuntu/ lucid-security universe main multiverse restricted' updated to new dist
2010-05-06 10:25:42,965 DEBUG examining: 'deb http://archive.ubuntu.com/ubuntu/ karmic-updates universe main multiverse restricted'
2010-05-06 10:25:42,966 DEBUG entry 'deb http://archive.ubuntu.com/ubuntu/ lucid-updates universe main multiverse restricted' updated to new dist
2010-05-06 10:25:42,966 DEBUG examining: 'deb http://archive.ubuntu.com/ubuntu/ karmic-backports universe main multiverse restricted'
2010-05-06 10:25:42,966 DEBUG entry 'deb http://archive.ubuntu.com/ubuntu/ lucid-backports universe main multiverse restricted' updated to new dist
2010-05-06 10:25:42,988 DEBUG running doUpdate() (showErrors=True)
2010-05-06 10:25:43,361 WARNING updateStatus: dlFailed on 'http://security.ubuntu.com/ubuntu/dists/lucid-security/universe/i18n/Translation-fr.bz2' 
2010-05-06 10:25:43,377 WARNING updateStatus: dlFailed on 'http://security.ubuntu.com/ubuntu/dists/lucid-security/main/i18n/Translation-fr.bz2' 
2010-05-06 10:25:43,452 WARNING updateStatus: dlFailed on 'http://security.ubuntu.com/ubuntu/dists/lucid-security/multiverse/i18n/Translation-fr.bz2' 
2010-05-06 10:25:43,457 WARNING updateStatus: dlFailed on 'http://security.ubuntu.com/ubuntu/dists/lucid-security/restricted/i18n/Translation-fr.bz2' 
2010-05-06 10:25:58,492 WARNING updateStatus: dlFailed on 'http://archive.ubuntu.com/ubuntu/dists/lucid-updates/universe/i18n/Translation-fr.bz2' 
2010-05-06 10:25:58,493 WARNING updateStatus: dlFailed on 'http://archive.ubuntu.com/ubuntu/dists/lucid-updates/main/i18n/Translation-fr.bz2' 
2010-05-06 10:25:58,496 WARNING updateStatus: dlFailed on 'http://archive.ubuntu.com/ubuntu/dists/lucid-updates/multiverse/i18n/Translation-fr.bz2' 
2010-05-06 10:25:58,496 WARNING updateStatus: dlFailed on 'http://archive.ubuntu.com/ubuntu/dists/lucid-updates/restricted/i18n/Translation-fr.bz2' 
2010-05-06 10:25:58,528 WARNING updateStatus: dlFailed on 'http://archive.ubuntu.com/ubuntu/dists/lucid-backports/universe/i18n/Translation-fr.bz2' 
2010-05-06 10:25:58,529 WARNING updateStatus: dlFailed on 'http://archive.ubuntu.com/ubuntu/dists/lucid-backports/main/i18n/Translation-fr.bz2' 
2010-05-06 10:25:58,529 WARNING updateStatus: dlFailed on 'http://archive.ubuntu.com/ubuntu/dists/lucid-backports/multiverse/i18n/Translation-fr.bz2' 
2010-05-06 10:25:58,578 WARNING updateStatus: dlFailed on 'http://archive.ubuntu.com/ubuntu/dists/lucid-backports/restricted/i18n/Translation-fr.bz2' 
2010-05-06 10:27:02,190 DEBUG openCache()
2010-05-06 10:27:02,190 DEBUG failed to SystemUnLock() (E:Non verrouillé) 
2010-05-06 10:27:06,254 DEBUG /openCache(), new cache size 30182
2010-05-06 10:27:06,255 DEBUG needServerMode(): run in 'desktop' mode, (because of pkg 'ubuntu-desktop')
2010-05-06 10:43:02,131 DEBUG Installing 'xserver-xorg-video-all' (Distro KeepInstalledPkgs rule)
2010-05-06 10:43:21,494 DEBUG Running KeepInstalledSection rules
2010-05-06 10:43:22,547 DEBUG Kernel uname: '2.6.31-21-generic' 
2010-05-06 10:43:22,569 DEBUG ./get_kernel_list.sh returns: ['linux-generic', 'linux-image-generic', 'linux-server', 'linux-image-server', 'linux-virtual', 'linux-image-virtual', 'linux-xen', 'linux-image-xen', 'linux-preempt', 'linux-image-preempt', 'linux-rt', 'linux-image-rt']
2010-05-06 10:43:22,570 DEBUG linux-generic kernel already installed
2010-05-06 10:43:22,570 DEBUG Upgrading 'linux-generic' (Upgrading kernel from base-installer)
2010-05-06 10:43:24,014 DEBUG nvidiaUpdate()
2010-05-06 10:43:24,052 DEBUG Removing 'nvidia-glx-195' (old nvidia driver)
2010-05-06 10:43:24,073 DEBUG nv.selectDriver() returned 'nvidia-current'
2010-05-06 10:43:26,228 INFO installing nvidia-current as suggested by NvidiaDetector
2010-05-06 10:43:26,229 DEBUG Upgrading 'brasero' (Distro PostUpgradeUpgrade rule)
2010-05-06 10:43:32,786 DEBUG Removing 'libflashsupport' (Distro PostUpgradeRemove rule)
2010-05-06 10:43:32,786 DEBUG Removing 'kvm-source' (Distro PostUpgradeRemove rule)
2010-05-06 10:43:32,786 DEBUG Removing 'gtk-qt-engine' (Distro PostUpgradeRemove rule)
2010-05-06 10:43:32,787 DEBUG Removing 'libparted1.8-12' (Distro PostUpgradeRemove rule)
2010-05-06 10:43:32,805 DEBUG Removing 'usplash' (Distro PostUpgradeRemove rule)
2010-05-06 10:43:32,824 DEBUG Removing 'xscreensaver' (ubuntu-desktop PostUpgradeRemove rule)
2010-05-06 10:43:32,849 DEBUG Removing 'gnome-cups-manager' (ubuntu-desktop PostUpgradeRemove rule)
2010-05-06 10:43:32,849 DEBUG Removing 'powermanagement-interface' (ubuntu-desktop PostUpgradeRemove rule)
2010-05-06 10:43:32,868 DEBUG Removing 'deskbar-applet' (ubuntu-desktop PostUpgradeRemove rule)
2010-05-06 10:43:32,888 DEBUG Removing 'nautilus-cd-burner' (ubuntu-desktop PostUpgradeRemove rule)
2010-05-06 10:43:32,906 DEBUG Purging 'ltsp-client' (Distro PostUpgradePurge rule)
2010-05-06 10:43:32,925 DEBUG Purging 'ltspfsd' (Distro PostUpgradePurge rule)
2010-05-06 10:43:32,944 DEBUG Purging 'linux-restricted-modules-common' (Distro PostUpgradePurge rule)
2010-05-06 10:43:32,945 DEBUG plugins for condition 'PostDistUpgradeCache' are '[]'
2010-05-06 10:43:32,945 DEBUG plugins for condition 'lucidPostDistUpgradeCache' are '[]'
2010-05-06 10:43:32,945 DEBUG plugins for condition 'from_karmicPostDistUpgradeCache' are '[]'
2010-05-06 10:43:32,945 DEBUG Installing 'ubuntu-minimal' (base meta package keep installed rule)
2010-05-06 10:43:35,306 DEBUG Installing 'ubuntu-standard' (base meta package keep installed rule)
2010-05-06 10:43:42,621 DEBUG Marking 'ubuntu-desktop' for upgrade
2010-05-06 10:45:51,568 DEBUG The package 'hostname' is marked for removal but it's a ESSENTIAL package