sudo apt purge libreoffice
sudo mv ~/.config/libreoffice/ ~/.config/libreoffice-back/
https://www.libreoffice.org/download/download/?type=deb-x86_64&version=6.4.1&lang=en-US
tar -xf LibreOffice_6.4.1_Linux_x86-64_deb.tar.gz
cd to folder
dpkg -i *.deb