Hi HW_Hack, we'll try to help, your KSP.log would help a lot so would updating module manager, the one you are using is very old. /home/user/.config/unity3d/Squad/Kerbal Space Program/ is the path Unity uses for the KSP player.log on *buntu systems so should be working, though why you can't access it via the terminal I don't know, is Nautilus not an option for you? The decoupler lives in /Kerbal Space Program/GameData/Squad/Parts/Utility/decouplerRadialTT-38K/ I know from my own Linux KSP install that the decoupler doesn't cause issues under normal conditions, so we need to find out what is happening to you, if you're running the x64 binary you will want to delete the settings.cfg and run KSP with LC_ALL=C as the location fix was not applied to the x64 build.