It's got to be the URIs, then. Go through and make sure all of the URIs in your list match mine (except, of course, for the Warpinator entry).
Ensure the 'https' matches... there was an issue a bit ago with using 'http'.
Note especially the verbiage there:
Don't change the rest of each line, just substitute
https://ppa.launchpadcontent.netforhttp://ppa.launchpad.netin each line.Note the change from
httptohttps.