Re: Lightroom
If you can't get on with DarkTable or Adobe Lightroom, try LightZone (https://lightzoneproject.org). There's a registration requirement but it's free and automatic. I couldn't get on with DarkTable after I found that RawTherapee didn't work properly on raw FujiFilm HS50EX files but LightZone works perfectly and it's available for linux, BSD, Mac OS and Windows.