I managed to fix things, however, and I have Hangouts working again which means Luminosity is set to roll!
Given that it's been a while, I'm wondering if any of you have topic requests, questions, etc in particular you'd like to see me take on. If you do, please leave them in the comments below and I'll work whatever seems interesting into next week's Luminosity.
I will also announce the exact time and other details (irc channel, etc) in the middle of next week as I find fewer people forget if I announce it closer to the date. I am leaning towards 17:00 UTC next Friday, however.
Oh, and if Hangouts aren't working for you on Linux, make sure you don't have both libudev0 and libudev1 installed. Getting rid of libudev0 magically cured things for me, though I had to symlink libudev1 to libudev0 in the filesystem to get Chrome to start again. Gaaaaah.)