Warm Up

Deep breath.
Cup of tea.
Remove the old LaTeX junk you've installed. Search for 'texlive' or 'latex' in your package manager's installed files.
Find tlmgr in your package manager.

`tlmgr`

The LaTeX Package manager is known as tlmgr, and often resides in /opt/texlive/${YEAR}/bin/x86_64-linux/tlmgr. Double-check the location:

ls -l /opt/texlive/${YEAR}/bin/x86_64-linux/tlmgr
ls /opt/texlive/${YEAR}/texmf-dist/scripts/texlive/tlmgr.pl

Double-check the year. It should not match the real year, it should match the texlive.

You can't use tlmgr unless it's in the $PATH.

Check if it is in the $PATH then if it should be in the path:

echo $PATH
grep texlive -r /etc/profile*

If tlmgr is where it should be, but not in the path, you can add it temporarily:

export PATH=${PATH}:/opt/texlive/${YEAR}/bin/x86_64-linux

...or just reboot.

Search packages:

tlmgr search --global epstopdf

Can't find what you need? Search for a specific file instead:

tlmgr search --global --file epstopdf-base.sty
sudo tlmgr install epstopdf-pkg

latexmk
luatex
titletoc
titlesec
multicol
microtype
graphicx
fontspec
makeindex
imakeidx