convert -list font
fc-list | grep -i arial
convert -list font | grep "Font:" | grep Arial
sudo add-apt-repository ppa:andrewsomething/typecatcher
sudo apt-get update && sudo apt-get install typecatcher
press alt+f2 and type /usr
sudo cp -R /home/nitinw/Downloads/oswald /usr/share/fonts/truetype
http://askubuntu.com/questions/191778/how-to-install-many-font-files-fast-and-easy
It's also a good idea to manually rebuild the font cache, so you can immediately use the fonts everywhere:
fc-cache -f -v