Author: Alexander Zangerl <az@debian.org>
Subject: fix #659009 by disabling validate_encryption_settings, which cannot work with public key encryption

--- a/bin/duplicity
+++ b/bin/duplicity
@@ -377,7 +377,9 @@ def write_multivol(backup_type, tarblock
         mf = globals.restart.last_backup.get_local_manifest()
         globals.restart.checkManifest(mf)
         globals.restart.setLastSaved(mf)
-        validate_encryption_settings(globals.restart.last_backup, mf)
+# az [2012-03-11 Sun 12:11]
+# this conflicts with public key encryption
+#       validate_encryption_settings(globals.restart.last_backup, mf)
         mf.fh = man_outfp
         last_block = globals.restart.last_block
         log.Notice(_("Restarting after volume %s, file %s, block %s") %
