It does NOT use (as maybe implicitely expected) LibreOffice at all, but some other software, namely Pandoc (plus some more). See screenshot.It works (as explicitely required) on the command line. Use the option(menu) key on your keyboard, or click your secondary mouse button (usually the right button on a right-handed mouse). You can use the option menu in Pages desktop view to 'Download a Copy. I just found that as a shortcut, you don't have to open the document in Pages. I found that DOCX format gave a more faithful copy than PDF. I tried with a short sample Pages document and LibreOffice 4.4.

With LibreOffice, navigate to your downloads folder and open the document.

Export as PDF or as Microsoft Word (.DOCX).

Select the tools menu (a spanner/wrench icon in the top right of the screen).

In a new browser tab, it shows you a word processor interface to your document.

Double-click the icon for your uploaded document.

It shows you an editable version of your document in a kind of file manager view

Drag your Pages document onto your browser.

I am not sure what this means, but you probably need to accept this to be able to open Pages.) (It also may ask you to upgrade to iCloud Drive. Unfortunately, no Linux browsers are supported (as of 2015) so ignore this message: export still works. The site asks you to upgrade to a supported browser to use all the features.If you don't have an Apple ID, register for one at no cost.

With a recent version of Firefox, or Chrome, visit Apple's iCloud website.Unfortunately, Pages doesn't have OpenDocument (ODT) export, (as of 2015), but it does have DOCX (Microsoft Word) and PDF (Portable Document Format) exports. If you don't have access to an Apple operating system, use Apple's no-cost 'in-browser' version of Pages to export it in a format that you can open with LibreOffice.

Libreoffice osx