Automatically Install a Single Font

1
Download a TrueType font. (The file extension will be .ttf.) Unzip your file if necessary.

2
Double click on the downloaded file. This should open a font-viewer window.

3
Click Install Font in the lower right-hand corner. Congratulations! Your font has been installed.

The above will not work on all systems as the Font Viewer needs root privilege to install a font. To deal with this:

1
Open a terminal window

2
Type "sudo gnome-font-viewer <path-to-font-file> and hit enter (replace <path-to-font-file> with the path to the font file you want to install!)

3
Enter your user password when prompted

4
Click "Install". Job done!

Manually Install Multiple Fonts

1
Download TrueType fonts. (The file extension will be .ttf.) Unzip your files if necessary.

2
Move your files to the ~/ Directory. The ~/ Directory is your home folder. This means that if you were logged in as cruddpuppet, the directory would be /home/cruddpuppet/ .

3
Go to Applications > Accessories > Terminal. This will take you to the terminal.

4
Type cd /usr/local/share/fonts/truetype without quotes. This is where Ubuntu keeps its fonts. (The path is cd /usr/share/fonts/truetype on some distros)

5
Type sudo mkdir myfonts without quotes. This will make a directory called myfonts in which to store your fonts. If youre not logged in as root, you will be prompted to provide your password.

6
Type cd myfonts without quotes. This moves you into the new directory.

7
Type sudo cp ~/fontname.ttf . without quotes. This moves the TrueType fonts into your new directory. (Alternatively, type sudo cp ~/*.ttf .; the * acts as a wildcard, allowing you to move all your fonts from the ~/ Directory at once.)

8
Type sudo chown root fontname.ttf and then sudo mkfontdir without quotes. Since ownership has to belong to the root, this makes a directory for your font.

9
Type cd .. and then fc-cache without quotes. This lets Ubuntu know that the fonts are installed so that they dont disappear.

Hope this helps.
Enjoy! - Nasty