I've tried this guide How do I install LibreOffice 4?
But I get this message

Can someone please explain why this is happening? And can someone tell me how to download it?
I've tried this guide How do I install LibreOffice 4?
But I get this message

Can someone please explain why this is happening? And can someone tell me how to download it?
You downloaded the .rpm file. .rpm is used by Fedora and Red Hat, but Ubuntu and Debian use .deb.
The correct command to un-tar this file would be:
tar -xvzf LibreOffice_4.0.0_Linux_x86-64_rpm.tar.gz
Did you download using the links from my post? They link to the proper .deb files.
sudo add-apt-repository ppa:libreoffice/ppaIf you don't have LibreOffice installed for whatever reason, then instead of the last line, type this.sudo apt-get update
sudo apt-get dist-upgrade
sudo apt-get install libreoffice– HarlemSquirrel Apr 29 '13 at 17:58