This looks like a transient error, some issue with python3 on your install?
But regardless, more recent releases of Ubuntu have deja-dup depend directly on duplicity and gvfs-backends ** Project changed: deja-dup => deja-dup (Ubuntu) ** Changed in: deja-dup (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1784238 Title: Duplicity (Deja Dup) on Ubuntu 18.04.1 requests install of package "gvfs-backends," install fails after too many errors To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/deja-dup/+bug/1784238/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs