I haven't been able to pin down the exact object that causes the problem on my system, however, it does look like long directory/file owner's user name may be the culprit, as described here: http://comments.gmane.org/gmane.comp.sysutils.backup.duplicity.general/661
I have a user on the system with a 50-character name, and excluding the directories owned by that user seems to have solved the problem.
I haven't been able to pin down the exact object that causes the problem on my system, however, it does look like long directory/file owner's user name may be the culprit, as described here: comments. gmane.org/ gmane.comp. sysutils. backup. duplicity. general/ 661
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I have a user on the system with a 50-character name, and excluding the directories owned by that user seems to have solved the problem.