Several ways to create a user on Ubuntu and other useful commands.
How to Add a User
In the example below, we will create the user ploshadka.
а) adduser
sudo adduser ploshadka
Then we create a password, answer typical questions.
б) useradd
useradd -m -s /bin/bash ploshadka
Set a password:
passwd ploshadka
In both cases, a user directory will be created:
cd /home/ploshadka
Sudo Group for a User
Use next command to add the user ploshadka to the sudo group:
usermod -aG sudo ploshadka
How to Delete a User
If you need to delete a user:
userdel ploshadka
Logging In as a New User
This can be done in one of the ways:
а)
su - ploshadka
б)
sudo -iu ploshadka
Exit
If you need exit to the root user:
exit