There's the following error in your log file
=====
2008-05-16 12:56:25,346 ERROR IOError/SystemError in cache.update(): 'Failed to fetch http://fr.archive.ubuntu.com/ubuntu/dists/gutsy/Release.gpg Échec de la connexion
'. Retrying (currentRetry: 0)
2008-05-16 12:56:25,346 ERROR doUpdate() failed completely
=====
This might be due to a network error during the upgrade. You've reported this a while ago, is it still an issue ?
Thanks for your report.
There's the following error in your log file fr.archive. ubuntu. com/ubuntu/ dists/gutsy/ Release. gpg Échec de la connexion
=====
2008-05-16 12:56:25,346 ERROR IOError/SystemError in cache.update(): 'Failed to fetch http://
'. Retrying (currentRetry: 0)
2008-05-16 12:56:25,346 ERROR doUpdate() failed completely
=====
This might be due to a network error during the upgrade. You've reported this a while ago, is it still an issue ?
Thanks.