I am on SL7 (EL7), and after upgrading from 6, I now get the error ! LaTeX Error: File `lineno.sty' not found.I don't remember how I made that package available in 6. I have spent a while searching for a solution, but this package does not appear to be available from standard repositories, and I have not found a clear description on the best way to proceed. I realize I could download from ctan. But I am wondering if there is a better (staying with yum) way to handle this and other missing texlive packages.  
How to handle unavailable texlive packages on el7
yum;latex