Its app icon resembles an orange suitcase with a white "A" on it. Ubuntu Linux comes with this built-in software manager, allowing you to remove programs in just a few clicks. If you can't find Ubuntu Software, click the Ubuntu logo in the upper-left corner of the screen, type ubuntu software into the search bar, and click the Ubuntu Software app icon. This computer-shaped tab is at the top of the Ubuntu Software window. Scroll through the list of installed programs until you arrive at the one that you want to uninstall, or type the name of an installed program into the search bar in the top-right corner of the window. It's to the right of the program that you want to uninstall. If asked to confirm, click Remove again, or click OK. The prompt that you see may vary slightly depending on your version of Ubuntu. Your program should now be uninstalled.

TL;DR in Vietnamese:
Mở phần mềm Ubuntu. Nhấp chuột vào tab Installed (Được cài đặt). Tìm chương trình muốn gỡ cài đặt. Nhấp chuột vào Remove (Gỡ bỏ). Xác nhận quyết định khi được hỏi. Tắt phần mềm Ubuntu.