First, uninstall the old version of Libre Office included in Debian.
sudo apt-get remove libreoffice-*
Once the old version of the office suite is off of Debian, go to the Libre Office website and grab the 6.0 version. There are 64-bit and 32-bit DEB packages available. When the download finishes, use the terminal to CD into the download directory.
Even though we downloaded Libre Office in the Debian package format, we still have to deal with a Tar archive. Use this command to extract the Libre Office 6.0 archive.
After extracting everything, use CD to move the terminal into the “DEBs” folder.
cd LibreOffice_*_Linux_x86-64_deb/ cd DEBS
Finally, use the dpkg tool to start the installation of Libre Office 6.0.
sudo dpkg -i *.deb