I’m running Duplicacy Web UI for the first time on a fresh installation of Ubuntu 20.04. The documentation says that this is supposed to start a 30-day trial, but it hasn’t - Duplicacy still says it’s “Unlicensed” and won’t run backups.
I found one forum post with a similar issue, and tried the solution recommended there (installing ca-certificates, dbus, and tzdata) but they were all already installed.