I can remember that I might get a easy solution, but now I can't find this in this site.
$ whereis pdflatex
pdflatex: /usr/bin/pdflatex /usr/bin/X11/pdflatex /usr/share/man/man1/pdflatex.1.gz
But, updated installation location is
/usr/local/texlive/2018/bin/x86_64-linux
Some solution
Set PATH to use the current TeX Live bin directory
TeXlive update - how do I permanently set the path?
How do I configure the paths for TexLive2011 to work on my system with TexWorks 0.5?
