There are number of ways to install LibreOffice. The easiest and most efficient way would be via the software Center. You can install the applications that you need or install all of them
Another way is to install the applications via PPA (You can read about PPA’s Here) This will also ensure that you have the latest version on your system and will be updated. If you have LibreOffice already installed this process will update your version to the latest update
1. Add the PPA.
LibreOffice 7.0.x specific PPA has been created hours ago contains the latest deb packages. You can add it to your system by launching terminal and run command:
sudo add-apt-repository ppa:libreoffice/libreoffice-7-0
Type user password (no asterisk feedback) when it prompts and hit Enter to continue.
You may alternatively add the LibreOffice Fresh PPA and wait it to be updated via command:
sudo add-apt-repository ppa:libreoffice/ppa
Next you should run the update in terminal
sudo apt update
2. Install LibreOffice 7.0.
Software Updater utility will keep back the new PPA packages. So you have to run command in terminal to install / upgrade to LibreOffice 7.0:
sudo apt full-upgrade