Praat scripts throw "unknown function" errors in Ubuntu

Question

I wrote the simplest praat script, and it runs fine on my Mac:

Read from file... sound.wav
selectObject (1)

It assumes there's a wave file called sound.wav. However, when I try to do the same on my Ubuntu Linux box, I get the error:

Error: Unknown function «selectObject» in formula.
Script line 2 not performed or completed:
« selectObject (1) »

I tried with selectObject(1), selectObject(0) and other variations, and they all fail. However, if I do "plus Sound sound" it seems to work. Right after that, if I try to do

s = do ("To Manipulation...", 0.01, 75, 600)

that works on my Mac too, but also fails on Ubuntu with

Error: Unknown function «do» in formula.

Why is that? How can I make it work?

I installed praat on Ubuntu using sudo apt-get install praat. Tried it with Ubuntu 12 and 13, and it fails in both cases.

Thanks!

Answer 1

Answer to my own question: getting the praat binaries from the praat site works. The ones from aptitude do not.