[Trisquel-users] GUI with fonts and staying root

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Just installed Trisquel alongside Windows 7 fifteen minutes ago. As I  
understand it, installing fonts on Linux systems in general is a simple  
matter of copying them into /usr/share/fonts. I of course need root  
privileges to do this. But when I use sudo su - to become root, that has no  
effect on the desktop and I still cannot copy fonts.

I often install new fonts, so is there any way to become root and stay that  
way forever?