I am a new Ubuntu user. I know my password to login on my Ubuntu laptop and from what I have read, the users own login password is also the password for any sudo commands in Terminal. However, when I try to use this password for sudo commands, it tells me authentication failure. What am I doing wrong?
1) Check if you use the sudo a good way for example :
2) check if you are in the sudo group
id | grep sudo
3) check the log file to have more info
4) to add the user in the sudo group
sudo adduser <username> sudo