How to change current username in ubuntu?

Question

Hello all,

I want to change my current username in ubuntu16.04 lts but when i run 

$ usermod -l newusername oldusername 

usermod: user   username is currently used by process pid.

so i want to know How could i change my username .

Thanks,

Answer 1

use with sudo bash or sudo su

Comments

Thanks Your help .But Still show me is  username is currently used by process pid .I use sudo bash and sudo su both of .Do i need to kill the process id?

I have no idea.

Answer 2

If you want to change current user,
1.Change new user name
$ sudo usermod -l new_username current_username

2.move home dir.
$ sudo mv /home/current_username /home/new_username

3.change home dir
$ sudo usermod -d /home/new_username new_username

Answer 3

why not login from root or make a new sudo user (roottwo) and using (roottow) form change old user name to new username