How to install "lpr"-command > simply use "lp"-command instead

How to install "lpr"-command > simply use "lp"-command instead

I'm new to LinuxLite, installed it on a rather old PC that became quite slow with LinuxMint... So far the experience is really good (a lot snappier!!), but a couple of things are different obviously... Thanks for your kind help:

This old PC is being used in a small shop as a cash desk, so it uses an EPSON thermal receipt printer, which I was able to install right away without problem.

But we do use a script to automatically print the receipts and it uses the "lpr"-command which does not seem to be installed in LinuxLite. All my attempts to install it did not work, so I ran out of ideas but it is probably a simple issue... here is the responses:

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