How/Where do I check my ubuntu laptops's CPU usage?
is a lightweight text-mode process viewer packed with handy features such as killing processes without entering their PID, displaying full command lines, etc with a colour display
How to install
open your Terminal (Ctrl-Alt-T ) and Type
sudo apt-get install htop
To run: type
htop This will show what you are asking. .
In your dash i.e. pressing
super key search for system monitor application.
If you are comfortable with command line there are tools like
htop where cpu usage can be viewed as well.
As said in previous answer you can use system monitor which is the best tool. If you want more information you can try some commands on terminal
top - its a command to see all the processes and their CPU usage. Just read the screen carefully and you would find lot of other useful information there.
you can press Ctrl+c to close it.
Or you can also try
cat /proc/cpuinfo - for other information about cpu