Qt + Linux + OpenOffice
How to automate work with Office packages and in particular OpenOffice (LibreOffice) in the Qt/C++ program on Linux?
For Windows I can use ActiveQt for Word/Excel automation, Disphelper for OpenOffice automation. But Disphelper works for Windows only.
What approach can I use in Linux(Ubuntu)?
I have looked into this myself. You will need to look at UNO and download the SDK for Libreoffice / Openoffice. Once you have this you can automate this software on any platform you want.
I haven't done much beyond the examples provided ( http://api.libreoffice.org/examples/examples.html#Cpp_examples ) since there was no pressing need but I believe this is the answer.
This has nothing to do with Qt but I don't see why you couldn't incorporate this into a Qt program. This should not be an issue.