ubuntu texlive install package

I advise to recur to an installation by hand of a tex package only when such tex package is not available in an ubuntu package.

Searching for it with

apt-file -x search '/textcomp.sty$'

I obtain the following results:

texlive-latex-base: /usr/share/texmf-texlive/tex/latex/base/textcomp.sty

and it say the tex package you look for is contained in the ubuntu package whose name is texlive-latex-base, so install it, if not already installed.

By the way, apt-file is a command to install separately from the apt-get package, and only a convenient and alternative way to search into the repositories the same way as http://packages.ubuntu.com/.