I was running PureOS for a month or two, but now I’m back on Ubuntu. I really loved the black and white desktop background of the waterfall in PureOS though.
Could anybody be so kind to upload it here so I can use it in Ubuntu as well?
You can download it yourself from the PureOS repos. Since you’re on Ubuntu, you might be able to install the .deb directly. Otherwise, just download the source tarball and unpack it.