Very useful Ubuntu tips and tricks.

How to change your Ubuntu password as a normal user.

jason@Yog-Sothoth:~$ passwd
Changing password for jason.
(current) UNIX password: 
Enter new UNIX password:

Just enter you current password and then enter a new one twice. It is that simple.

To install required updates, just run this command.

sudo apt update; sudo apt upgrade

This will update the repos and then install any required updates in one go.

To enable SSH connections from a remote PC to your machine, run this command.

sudo apt install ssh

This installs a SSH server, ready to accept outside connections.

It can also be configured to accept a login using a key file instead of a password.

http://securitronlinux.com/debian-testing/how-to-setup-an-ssh-login-using-host-keys-instead-of-a-password/.

Install a lovely Windows 7 or Windows 10 theme on Ubuntu MATE.

http://securitronlinux.com/bejiitaswrath/how-to-install-a-lovely-windows-7-gtk-theme-on-linux-mint-14/.

More lovely GTK themes for Ubuntu Gnome and MATE.

http://securitronlinux.com/bejiitaswrath/lovely-gtk-themes-for-the-linux-mint-mate-desktop/.