How to hide a user from login screen in ubuntu 14.04
1. Hide the user
First make the `user` a system user, so it will get hidden from login screen.
<span class="nb">cd</span> /var/lib/AccountsService/users/
<span class="nb">sudo </span>vim user.conf
Here user is the name of the user you want to hide. Now, change following:
<span class="nv">SystemAccount</span><span class="o">=</span><span class="nb">false</span>
To:
<span class="nv">SystemAccount</span><span class="o">=</span><span class="nb">true</span>
So, you hid your user. Now How will you login? For that you need a manual login method.
2. Add manual login option
<span class="nb">sudo </span>vim /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf
add the following line at last,
greeter-show-manual-login<span class="o">=</span><span class="nb">true</span>
Done.
Now you can reboot the system. You will see there is no login for $USER. Although there will be an option to login manually using username and password. Go for it!
https://vitux.com/how-to-change-login-lock-screen-background-in-ubuntu/
https://www.cnet.com/how-to/upgrade-to-windows-10-free-heres-how/
https://www.howtogeek.com/howto/14369/change-or-reset-windows-password-from-a-ubuntu-live-cd/