Let us start by creating a temporary user by using the following command. For this tutorial, we will be calling this user “pimytemp“.

sudo adduser pimytemp

sudo usermod -aG sudo pimytemp

logout

Now, log back into Ubuntu using “pimytemp” as the username and then the password you set.

sudo su

usermod -l <NEWNAME> -d /home/<NEWNAME> -m <OLDNAME>

usermod -l ella -d /home/ella -m gini

groupmod -n <NEWNAME> <OLDNAME>

groupmod -n ella gini

ln -s /home/<NEWNAME> /home/<OLDNAME>

ln -s /home/ella /home/gini

chown -h ella: /home/gini

exit

logout

sudo userdel pimytemp -f -r

Kill any process IDs running under the old user.