This is fixed in 19.10 by using the python3 version of duplicity.
You can get the fix on 18.04 by using the snap version of Deja Dup:
snap install deja-dup --classic
** Project changed: deja-dup => deja-dup (Ubuntu)
** Changed in: deja-dup (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1847900
Title:
Daily Deja Dup failure with "Failed with an unknown error."
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