tbh I think Baker and MH are both wrong, since they seem to take some cliche internet meme version of Linux and then criticize that, instead of installing Ubuntu and basing their criticism on that. SVN vs Git has nothing to do with OSes, and OpenGL vs DirectX has nothing to do with Linux being user friendly.
Gimp etc. have nothing to do with Linux being newbie friendly, either. The Gimp UI is different from Photoshop, but it works fine for me and I don't look a gift horse in the mouth, if you know what I mean, I just learn how to use it. Same for Blender.
Ubuntu 10.4 is practically identical to Fedora and everything else that uses GNOME, only one desktop is orange or something and the other is blue. That's how different the two distros are.
I recommend installing the damn thing and using it for a while before ripping it apart in the air

anyway, Darkplaces runs on Ubuntu just fine, so do half a dozen other quake engines. Personally my Quake folder is /home/gb/quake, inside that is a bunch of engines and the id folder, inside which are the pakfiles etc. I have a bash script to run rmq, which is located in ~/bin/rmq. Other mods I start from the terminal. I also have bash scripts to compile my maps, start blender, play doom, and so on. They are easy enough to write - like a batch file in DOS.
Running mods: Right click the desktop icon, click properties and edit the command line. Or create a new laucher. Alternatively if you don't play the mod often, start gnome terminal, cd to the quake dir and do ./myengine -game blah.
Installing Quake / engines: Do not install Quake engines and similar stuff via the package manager, just download what you want from the web and have one folder where you keep everything. Since you're probably the only person playing Quake on your PC, it makes no sense doing a multi-user install (/usr/games/quake or anything like that). Install Quake manually by copying an engine and the pakfiles, believe me it is the cleanest thing to do since you probably also install your mods manually, and you want no confusion between the package manager and your manually installed mods... just install everything manually.
About Quake Injector - I thought it was specifically NOT for mods, since it uses Quaddicted as a backend?
