How to install the last LibreOffice version by the apt-get command? I ran the followed commands at a Ubuntu 16.04 and just got version 6.2.8.2 but the last official one is 6.4.
sudo apt-add-repository ppa:libreoffice/ppa
sudo apt update
sudo apt upgrade
sudo apt install libreoffice
Second the official developers, LibreOffice-official-version Ubuntu 16.04 should be 5.1.6~rc2-0ubuntu1~xenial10. Because I had manually added sudo apt-add-repository ppa:libreoffice/ppa I was able to got libreoffice 6.2.8.2.
To achieve the 6.4 and newer installation they recommend to download the package or simple use sudo snap install libreoffice.