As others have pointed out, you're not going to be able to use Win32::OLE on Ubuntu.

I've got one idea that could work, but I have never looked into. You should be able to install LibreOffice, which can read most Word documents (see here for more details). I suspect (but don't know for sure) that there might be some kind of API available to automate LibreOffice - similar to using OLE to automate Office applications on Windows. If not, you should be able to open the Word document for viewing/editing.

This link might have some helpful information about automating LibreOffice.