Instalando o LibreOffice 4.x no Debian Wheezy
1. Edite o sources.list do seu Debian Wheezy usando um editor:
# gedit /etc/apt/sources.list
2. Adicione as linhas abaixo no sources.list e salve as alterações:
# Backports Debian Wheezy
deb http://ftp.debian.org/debian/ wheezy-backports main contrib non-free
3. Atualize a lista de pacotes com o apt-get:
# apt-get update
4. Instalando o LibreOffice 4.x:
# apt-get -t wheezy-backports install libreoffice libreoffice-help-pt-br libreoffice-l10n-pt-br