Merci, voilà les résultats de ces 4 commandes :
jcglt@jcglt-laptop:~$
1. lsb_release -d
Description: Ubuntu 16.04.1 LTS
jcglt@jcglt-laptop:~$
2. cat /etc/apt/sources.list.d/*.list | grep -v ^#
deb [url]http://ppa.launchpad.net/adrozdoff/emacs/ubuntu[/url] xenial main
deb [url]http://ppa.launchpad.net/caldas-lopes/ppa/ubuntu[/url] xenial main
deb [arch=amd64] [url]http://dl.google.com/linux/earth/deb/[/url] stable main
deb [url]http://ppa.launchpad.net/gqrx/gqrx-sdr/ubuntu[/url] xenial main
deb [url]http://ppa.launchpad.net/kamalmostafa/fldigi/ubuntu[/url] xenial main
deb [url]http://ppa.launchpad.net/libreoffice/ppa/ubuntu[/url] xenial main
deb [url]http://ppa.launchpad.net/myriadrf/gnuradio/ubuntu[/url] xenial main
deb [url]http://ppa.launchpad.net/opencpn/opencpn/ubuntu[/url] xenial main
deb [url]http://ppa.launchpad.net/stellarium/stellarium-releases/ubuntu[/url] xenial main
deb [url]http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu[/url] xenial main
deb [url]http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu[/url] xenial main
deb [url]http://download.virtualbox.org/virtualbox/debian[/url] xenial non-free contrib
jcglt@jcglt-laptop:~$
3. apt-cache show libreoffice-writer | grep -i depends
Depends: libreoffice-base-core (= 1:5.2.3~rc2-0ubuntu1~xenial1), libreoffice-core (= 1:5.2.3~rc2-0ubuntu1~xenial1), libc6 (>= 2.4), libgcc1 (>= 1:4.2), libicu55 (>= 55.1-1~), libstdc++6 (>= 5.2), libxml2 (>= 2.7.4), uno-libs3 (>= 5.1.0~alpha), ure, zlib1g (>= 1:1.1.4)
Pre-Depends: dpkg (>= 1.17.13)
Depends: libreoffice-base-core (= 1:5.1.4-0ubuntu1), libreoffice-core (= 1:5.1.4-0ubuntu1), libabw-0.1-1v5, libc6 (>= 2.4), libe-book-0.1-1, libetonyek-0.1-1, libgcc1 (>= 1:4.2), libicu55 (>= 55.1-1~), libmwaw-0.3-3, libodfgen-0.1-1, librevenge-0.0-0, libstdc++6 (>= 5.2), libwpd-0.10-10, libwpg-0.3-3, libwps-0.4-4, libxml2 (>= 2.7.4), uno-libs3 (>= 5.1.0~alpha), ure, zlib1g (>= 1:1.1.4)
Depends: libreoffice-base-core (= 1:5.1.2-0ubuntu1), libreoffice-core (= 1:5.1.2-0ubuntu1), libabw-0.1-1v5, libc6 (>= 2.4), libe-book-0.1-1, libetonyek-0.1-1, libgcc1 (>= 1:4.2), libicu55 (>= 55.1-1~), libmwaw-0.3-3, libodfgen-0.1-1, librevenge-0.0-0, libstdc++6 (>= 5.2), libwpd-0.10-10, libwpg-0.3-3, libwps-0.4-4, libxml2 (>= 2.7.4), uno-libs3 (>= 5.1.0~alpha), ure, zlib1g (>= 1:1.1.4)
jcglt@jcglt-laptop:~$
4. dpkg -l | grep libreoffice-wr
ii libreoffice-writer 1:5.2.3~rc2-0ubuntu1~xenial1 i386 office productivity suite -- word processor
ii libreoffice-writer2xhtml 1.0.2-10ubuntu2 all Writer/Calc to XHTML converter extension for LibreOffice
jcglt@jcglt-laptop:~$
Modération : merci à l'avenir d'utiliser les balises code (explications ici).