Well the story is, I have Xubuntu operating system on my computer and really want to play the mod pack on this computer. I have tried the .jar and .exe. I have the latest version of JDK(Java developer kit). Minecraft and other jar based files work on my computer, but not any of the ftb ones. Any help on how I can get it to work?. In summary: Operating System: Xubuntu 12.04 FTB Launcher version : Newest (Tried recently) Minecraft Version: 1.4.2, can't open the launcher though. Java version: JDK(Java Dev Kit Runtime) 6 Detailed description of the issue / how can the issue be recreated: None of the launcher files downloaded from the site can be launched. Error logs: The file '***' is not marked as executable. If this was downloaded or copied from an untrusted source, it may be dangerous to run. For more details, read about the executable bit. Thanks for any help in advance!