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Then you can go to Accessories -The sudo command executes a command with administrative privileges (root-user administrative level), which is necessary, for example, when working with directories or files not owned by your user account.
When using sudo you will be prompted for your password.
Only users with administrative privileges are allowed to use sudo.
Be careful when executing commands with administrative privileges - you might damage your system!
"Under Linux there are GUIs (graphical user interfaces), where you can point and click and drag, and hopefully get work done without first reading lots of documentation.