I meant no offence, it wasn't clear that you were a desktop user acting as their own 'admin'. Many users of R are not. I have experience as an R user on windows desktop, as well as my companies hosted R server, on a commercial linux platform. As such I have an Admin (his name is Miles, and he's wonderful).
As I am not a desktop Linux user myself, I am not best placed to advise you how to configure your system for convenience in this regard, and will leave that to others. Best wishes to you.