Comment 25 for bug 1641423

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Barry Martin (barry-martin-3-c) wrote : Re: Back up failed with message: Failed to execute child process "duplicity" (No such file or directory)

What corrected for me was Seth's post in https://bugs.launchpad.net/deja-dup/+bug/1606449 of:

    sudo apt install duplicity
    sudo apt install python-gi

Immediately works, though it appeared my system only needed to install duplicity and python-pi was already at the newest version and did not install.

The issue appeared on my laptop; I don't recall an issue with any desktops here. (Don't know if that piece of trivia helps track down the problem source.)