Install True Type fonts on Ubuntu in three steps

It's very easy:

1)Create a .fonts subdirectory in your home directory
cd ~
mkdir .fonts

2)Move the .ttf file in the .fonts directory
mv myfont.ttf ~/.fonts

3)Refresh the font cache
sudo fc-cache -f -v

And your font should be ready to be used.
Credits to Detector Pro -I streamlined the process a bit, being comfortable with the command line.