Follow the instructions below to download, install, register, and run the editor for the Unity game engine in Linux Mint.
1. Open a web browser and navigate to the URL “https://blogs.unity3d.com/2015/08/26/unity-comes-to-linux-experimental-build-now-available/“, then click the link labelled “Official 64-bit .deb Package” and wait for the file to download.
2. Double-click the package file to start installing it and wait for installation to complete.
3. Open a command prompt window and enter the command “sudo /opt/Unity/Editor/Unity”, enter the correct password when prompted, and wait for Unity to load.
4. On the “Sign into your Unity Account” page, click the “create one” link to create a new Unity account. A web page titled “Create a Unity ID” will be loaded in a web browser. Enter values in the required fields and click the “Create a Unity ID” button. A message will appear stating that a confirmation email has been sent to the specified email address.
5. In an email client, open the email from Unity and click the link within it to confirm the specified email address.
6. Back in the web browser, click the appropriate button to proceed.
7. Back in the Unity window, enter the username and password just registered and click the login button.
8. Follow the prompts to complete the registration process. Specify the “Unity Personal” license option when prompted. When the survey page appears, scroll to the bottom and click the OK button to proceed.
9. On the “Create a project” screen, click the “New project” button.
10. On the next page, enter the value “UnityTest1” in the “Project name” box, then click the “Create project” button. The main Unity Editor window will load.
11. In the Unity Editor window, select the item “File – Build and Run” from the main menu bar.
12. On the Build Settings dialog that appears, locate the “Add Current” button under the “Scenes In Build” list and click it.
13. On the dialog titled “Scene Has Been Modified” that appears, click the Save button, then, on the next dialog, enter the value “Scene1” in the Name box and click the Open button. Control will return to the Build Settings dialog, and the item “Scene1.unity” will appear in the Scenes In Build list.
14. At the bottom of the Build Settings dialog, click the Build and Run button.
15. On the dialog titled “Build Linux” that appears, enter the value “UnityTest1” in the Name box and click the Open button. The “game” (such as it is) will build and a new dialog titled “UnityTest1 Configuration” will appear.
16. On the Configuration dialog, click the “Windowed” checkbox to activate it. Otherwise, accept the default values. Click the OK button to proceed.
17. The “game” (again, such as it is) will start in a window, and the player will be presented with a featureless gray-and-blue expanse.