Guide to install and run the Technic Launcher in Linux Mint 17/Ubuntu 14: Q: Why is this guide necessary? A: Because I've had difficulty finding a guide online that actually worked. And I want to share my solution with the community. Tip: Copy the commands one at the time, and middle click/mousewheel click in Terminal to paste. Step 1: Uninstall Java, to make sure you get the correct Java version installed. Run the following in Terminal: sudo apt-get-purge openjdk* Step 2: Install Oracle Java 7. Run the following commands in Terminal: sudo add-apt-repository ppa:webupd8team/java sudo apt-get update sudo apt-get install oracle-java7-installer Step 3: Download Technic Launcher. From http://technicpack.net/download click on the 'Linux' button, and download the .jar file. Step 4: Move the .jar file to where you want the Launcher to be. I'd recommend Desktop. Don't worry. You'll get to pick where to install the Launcher later. Step 5: Allow the .jar file to run as a program. Right click the .jar file > Properties > Permissions Make sure the box is ticked next to 'Allow executing file as program' Don't close the properties window. Step 6: Make the .jar file run in Java. If you've closed the properties window, see Step 5. Go to Properties > Open With Scroll down the list, until you find 'Oracle Java 7 Runtime' Click on 'Oracle Java 7 Runtime' and set as default. You can now close the Properties window. Step 7: Install the Launcher. It should be as simple as a doubleclick on the .jar file. Just follow the instructions. When the Launcher loads, close it again. Now you should be good to go. Step 8 (Optional): Rename and choose a new icon for the Launcher. Right-click the .jar file > Properties > Basic To rename the file, just edit the text. To choose a new icon, click on the icon to the left. If you don't already have a path to your icon of choice, open 'Home' and navigate to the folder containing the image. Then copy the path. Now follow Step 8. Paste the path as location, and choose your new icon and click Open. Now you should have a working Launcher, with custom icon and name. Enjoy.