downhill
ALL my package research info (changelogs, version, existence of package) comes from software center. MUCH wider net than what you are demonstrating here with terminal command.
ALL installs/uninstalls=terminal only. I don't use the GUI SC for these two commands, never had much luck.
Splitting it up like that, conceptually, has been one of the by-accident smartest things I've ever done while on Solus.