I am trying to install the mathtools package using Linux Mint. My first attempt was via the Terminal:
sudo apt-get install mathtools on which I got response
Reading package lists...
Done Building dependency tree...
0% Building dependency tree
Reading state information... Done
E: Unable to locate package mathtools
Then I tried to install it manyally. I douwnloaded the zip file from here: http://www.ctan.org/pkg/mathtools, then moved the folder into the latex directory, then create the mathtools.sty file by typing
tex mathtools.dtx, and then the .sty file was into the right folder (the mathtools folder). However, when I tried to run my program the tex file still couldnt find it. Any ideas how to install the package? I need it for the \ceil and \floor functions?