I cannot make the package lwarp works

Question

When I load the package lwarp with the command \usepackage{lwarp} and I press F1 (or compile/build) I get the error with the file

/usr/share/texlive/texmf-dist/tex/latex/lwarp/lwarp.sty

at the line 33. Within that file, above line 33 is the command: \RequirePackage{ifptex} So I thought the problem should be that missing package, and indeed the error message says:

! LaTeX Error: File `ifptex.sty' not found.Type X to quit or to proceed,or enter new name. (Default extension: sty)Enter file name:! Emergency stop. flag __ ^^M

So I searched for that package and found it here ifptex.sty. Now I created a directory for that package: /usr/share/texlive/texmf-dist/tex/latex/ifptex/ and put there the package, but that doesn't fix the problem (I get the same message). I tried to put the ifptex package near the location of the other required packages (iftex and ifpdf) i.e.

/usr/share/texlive/texmf-dist/tex/generic/iftex

I created a folder at generic/ifptex but didn't work, I put the ifptex.sty file in the folder iftex but also didn't work.

My question is, why is this not working? How can I install the package properly? The instruction in the readme file says for installation:

In a system compliant to TDS 1.1, move the files as follows: *.sty → $TEXMF/tex/generic/ifptex

Which I have done so far, but I get the same error message.

I'm using TeXMaker 5.0.3 (compiled with Qt 5.15.3) with TeXlive in Ubuntu 22.04.1 LTS.

Answer 1

I followed the answer given here: How do I install an individual package on a Linux system? by @Loop Space using method 1. A brief summary here:

I typed in the terminal:

which tlmgr

to know where is tlmgr:

/usr/local/texlive/2022/bin/x86_64-linux/tlmgr

then I run the command:

sudo /usr/local/texlive/2022/bin/x86_64-linux/tlmgr install ifptex

and that solves my problem. Thank you.

Edit and comments clarification

This edit is because at first I made an error, I wrote a wrong solution, I spot the error thanks to @David Carlisle. I got confused, but now I think this is really the answer that solved my problem.

"Update"

Well I don't know if this is an update, but there is another way to install individual packages using the (Synaptic) Package Manager. First thing you need to know is the name of the package where the package is, I will explain below. For example if I got an error with \usepackage{IEEEtrantools} then I have to install the ieeetran LaTeX package, but in what debian package is that LaTeX package? To know that use the following command:

apt-cache search ieeetran

Or in general:

apt-cache search <name of the package>

That will print the name you are looking for. In this hypothetical case: texlive-publishers. Next just install it via (Synaptic) Package Manager