Cannot add PPA: 'ppa:mail-in-a-box/ppa'

Hello, I’m trying to install mailinabox on an Ubuntu 14.04 box via Azure. Whenever I follow the instructions from, or from other sites, installation fails after providing the hostname, with the error given in the title.

I’ve apt-get update/upgraded, reinstalled ca-certificates, confirmed time sync, and followed the steps from here:

But to no avail. What should I do?

Can you add the PPA manually?

Thank you for the response. I cannot add it manually, I get the same error.

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