Ubuntu 22.04
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Initial Settings : Add User Accounts2022/04/25

After installing Ubuntu System, there is only a user you configured during installation except System Accounts and he is an administrative user.
If you'd like to add more common user accounts on System, Configure like follows.
[1] For example, Add a [jammy] user.
sudo adduser jammy

[sudo] password for ubuntu:  # input self password
Adding user `jammy' ...
Adding new group `jammy' (1001) ...
Adding new user `jammy' (1001) with group `jammy' ...
Creating home directory `/home/jammy' ...
Copying files from `/etc/skel' ...
New password:           # set user password
Retype new password:    # confirm
passwd: password updated successfully
Changing the user information for jammy
Enter the new value, or press ENTER for the default
        Full Name []:   # input user info (OK with empty all if you do not need)
        Room Number []:
        Work Phone []:
        Home Phone []:
        Other []:
Is the information correct? [Y/n] y
[2] If you'd like to give privileges to a new user, Configure like follows.
usermod -aG sudo jammy

su - jammy

# try to run a command which requires root privilege

sudo ls -l /root

[sudo] password for jammy:    
# input self password

total 4
drwx------ 3 root root 4096 Apr 22 13:31 snap
[3] If you'd like to remove user accounts, Configure like follows.
# remove a user [jammy] (only removed user account)

ubuntu@localhost:~$ sudo
deluser jammy
# remove a user [jammy] (removed user account and his home directory)

ubuntu@localhost:~$ sudo
deluser jammy --remove-home
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