You can choose to add a new command or application to the list. In order to improve your Linux system's boot time, you need to find the unnecessary services and disable them. If you select “Application” however, you’ll just be presented with a list of installed applications, when you select one it will be instantly added to the list, you’ll need to edit it to configure the entry fully.
If you select a command, you’ll see the full edit window. To add a new application to the list, click the “Add” button in the bottom-left, you can choose to add a custom command to add an application. You can edit entries on the list to configure exactly how and when applications are run. Example, the following script is used to start a Java application as user oracle. In the edit window, you can change the name of the entry, the exact command run, the description of the entry, and configure a delay for when the command is actually run. First create your startup script /home/user/startup.sh, and make it. To edit an existing entry in the list, select the entry, then click the “Edit” button with the pencil icon at the bottom of the page. You can disable an entry in the automatic startup list or choose to run it now. You can choose to run the application in an entry directly, by clicking the “Run now” cogwheel icon in the bottom right. Tip: It’s recommended that you’re careful when disabling the default startup applications as they can be tied into some useful system functionality. You can choose to disable any of these applications by clicking the respective slider to the “Off” position. When you open the startup application list, you’ll see a list of applications that start as the computer boots up by default. Press the Super key, then type “Startup Applications” and hit enter. Tip: The “Super” key is the name that many Linux distributions use to refer to the Windows key or the Apple “Command” key, while avoiding any risk of trademark issues. To do so, press the Super key, then type “Startup Applications” and hit enter. In Linux Mint, you can manage the applications that start-up automatically through the “Startup Applications” menu.