Here are some more observations: After the password dialog appeared, duplicity says:
Preparing ... Scanning ... asks for the password again. One can break this loop only by cancelling the backup. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to duplicity in Ubuntu. https://bugs.launchpad.net/bugs/1604811 Title: duplicity ignores entered password Status in duplicity package in Ubuntu: New Bug description: Duplicity regularly asks for a password to encode the backup data. This used to work fine but somehow with the latest kernel update it seems to break. Duplicity asks for the password repetitively but does not continue to backup data. This occurs during delta backups only. I have deleted the password in the seahorse container and entered it again to no avail. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: duplicity 0.7.06-2ubuntu2 ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13 Uname: Linux 4.4.0-31-generic x86_64 NonfreeKernelModules: nvidia_uvm nvidia_modeset wl nvidia ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 CurrentDesktop: Unity Date: Wed Jul 20 15:07:23 2016 InstallationDate: Installed on 2013-05-17 (1159 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64+mac (20130424) SourcePackage: duplicity UpgradeStatus: Upgraded to xenial on 2016-04-22 (88 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/duplicity/+bug/1604811/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

