Being that hapless user who straggled with "bash-shell" (I finally decided to install tshell instead -- too much trouble fixing all the old scripts), I run into another trouble: my ubuntu-14 doesn't have acroread, ratfor90, latex, and many others commands. I first was looking for them by using

dpkg -s <command>

and after getting a negative result (which as I know by now, doesn't mean much), was still trying to install a package by using

sudo apt-get install <command>

-- with negative results for the command I've mentioned. I was successful for some commands (such as "gv", "gfortran", and some others).

What am I to do now? I never was good on installing commands by package downloading from the internet. Besides, there will be too many of them.