Those messages from the log look innocent enough to me. So the backups themselves work correctly, but when we get to the verification step at the end, you see an unknown error? No further output in that dialog?
The verification step tries to restore a canary file we insert in the backup, just to ensure that files can be restored from the new backup. So something is going wrong with that sample restore... ** Changed in: deja-dup (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to deja-dup in Ubuntu. https://bugs.launchpad.net/bugs/1980934 Title: Backup fail with unknown error Status in deja-dup package in Ubuntu: Incomplete Bug description: I removed the cache and start a backup in console like DEJA_DUP_DEBUG=1 deja-dup and got during verification the Unknown Error with following final outputs DUPLICITY: DEBUG 1 DUPLICITY: . Found manifest volume 845 DUPLICITY: INFO 1 DUPLICITY: . Found 845 volumes in manifest DUPLICITY: DEBUG 1 DUPLICITY: . Releasing lockfile b'/home/dh/.cache/deja-dup/5ed9f811abd16462101b9c5a817fde92/lockfile' DUPLICITY: DEBUG 1 DUPLICITY: . Removing still remembered temporary file /tmp/duplicity-7zeqbwou-tempdir/mkstemp-oc2otu7o-1 DUPLICITY: DEBUG 1 DUPLICITY: . Releasing lockfile b'/home/dh/.cache/deja-dup/5ed9f811abd16462101b9c5a817fde92/lockfile' DUPLICITY: DEBUG 1 DUPLICITY: . Releasing lockfile b'/home/dh/.cache/deja-dup/5ed9f811abd16462101b9c5a817fde92/lockfile' I than checked the cache which still contains all files including the lockfile ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: deja-dup 40.7-0ubuntu1 ProcVersionSignature: Ubuntu 5.13.0-52.59~20.04.1-generic 5.13.19 Uname: Linux 5.13.0-52-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.24 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Thu Jul 7 10:55:01 2022 DistributionChannelDescriptor: # This is the distribution channel descriptor for the OEM CDs # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor canonical-oem-somerville-bionic-amd64-20180608-47+beaver-three-eyed-raven+X92 InstallationDate: Installed on 2019-12-07 (942 days ago) InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 20180608-09:38 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=fr_FR.UTF-8 SHELL=/bin/bash SourcePackage: deja-dup UpgradeStatus: Upgraded to focal on 2020-10-04 (640 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/deja-dup/+bug/1980934/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp