Best command to clean and Speedup Ubuntu (Linux) OS
Please open the terminal.
1st command:- type: sudo apt-get update
now enter the password( password which you type is not visible on the screen because of some security reasons) after entering the password press enter
2nd command– sudo apt-get clean, press enter
3rd command-sudo apt-get autoclean, press enter
4th command-sudo apt-get remove, press enter
All unused and unnecessary file has been clear from the system. Enjoy your Speedup Ubuntu system.