Fifteen packages.
Fifteen packages?!
Fifteen packages!
Holy O'Connell is that a whole lot of packages! But I figured it out, yet again for the benefit of the three people here who give a damn.
If you encounter the 500 server error issue because you're hammering the Ubuntu Packages website a little too much with requests, use Google; begin a search with site:
and the URL you want to access, you'll bypass the 500 for a few minutes, anyway and be able to download all of the packages you need. But that's ridiculous. This is getting out of hand.
Can someone more experienced than I rebase and recompile this for GTK3?