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I'd like to have on-disk documentation, as there are many times when I must be off the net. I have Ubuntu 16.04 and Octave 4.0.0. When I click the Documentation tab I get "The info file /usr/share/info/octave.info or compressed versions do not exist" and that is well and truly the case. When I run

$ sudo apt install octave-doc

it runs normally but Octave still can't find it (even after re-launching).

When I run

$ find /usr -name "octave.info*"

or

$ find /opt -name "octave.info*"

I can't find it anywhere.

It's now time for me to ask for help. Is it possible to get the documentation installed, and if so, how?

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Answer 1 covers what you need, but I did not see any reference to how to install it. So, here is how to install Octave.info.

Start a linux terminal session Type the following command: sudo apt-get install octave-info

When the command completes, start Octave in the usual way, and when you click the Documentation tab, you will see all the reference documentation.

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According to apt-cache show octave-doc:

This package provides the following documentation in PDF format: a reference card in a4, letter and legal formats, a document on the C++ classes used by Octave, as well as the main octave documentation which is also included in info format in the octave-info package.

For .info documentation and online help, you need the octave-info package:

This package provides the following documentation in info format: a document on the C++ classes used by Octave, as well as the main octave documentation which is needed for the 'help -i foo' command within Octave.

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