New Zealand (South Island)
Seth Kenlon is a UNIX geek, free culture advocate, independent multimedia artist, and D&D nerd. He has worked in the film and computing industry, often at the same time. He is one of the maintainers of the Slackware-based multimedia production project Slackermedia.
Authored Comments
Comment sections are ok places for support, but not the greatest place. You might want to go to either http://linuxquestions.org or http://askubuntu.com/ or http://unix.stackexchange.com and ask for support there so that the maximum number of people see and have the chance to help you..
That said, the path of the ppa that you added looks "off". If you look at it, it contains both 'precise' and 'trusty', which seems wrong to me.
See https://opensource.com/comment/91396#comment-91396 for details.
I'm assuming (from the other repos in your error) that you are running Trusty, so see this page on how to get the right repo address for your system:
https://launchpad.net/~qtcam/+archive/ubuntu/trusty
Hope that helps!
I use sphinx at work and am definitely a fan. It's a relatively simple system of making really usable and attractive docs. Sure, it's more complex than writing in Google Docs and printing-to-PDF, but it has the advantage of being able to be managed by a version control system (git, mercurial, whatever), it can produce nice interactive documents, and it can export to a dozen different formats. Really a nice little system.