OK, I’ve got it working and it has successfully started backing up. Here’s how I got it running on properly.
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Added the Mono repos: http://www.mono-project.com/download/#download-lin-raspbian
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Installed mono-complete (I probably didn’t need to do that package, but I wanted to make sure I had everything) and the ca-certificates-mono package
sudo apt-get install mono-complete ca-certificates-mono
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Ran cert-sync:
sudo cert-sync /etc/ssl/certs/ca-certificates.crt
I think I forgot thesudo
the first time and that’s why I ran into errors. -
Installed the duplicati deb package
sudo dpkg -i duplicati*.deb
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Fixed the rest of the missing dependencies with
sudo apt-get -f install
After all that everything is working properly!