To support multiple languages these steps need to be done:
Run dpkg-reconfigure locales
(as root) and choose the languages (UTF-8 variants).
Run these commands as root to install the related packages:
apt update /usr/share/debian-edu-config/tools/install-task-pkgs /usr/share/debian-edu-config/tools/improve-desktop-l10n
Users will then be able to choose the language via the LightDM display manager before logging in; this applies to Xfce, LXDE and LXQt. GNOME and KDE both come with their own internal region and language configuration tools, use these. MATE uses the Arctica greeter on top of LightDM whithout a language chooser. Run apt purge arctica-greeter
to get the stock LightDM greeter.
libdvdcss is needed for playing most commercial DVDs. For legal reasons it's not included in Debian (Edu). If you are legally allowed to use it, you can build your own local packages using the libdvd-pkg
Debian package; make sure contrib
is enabled in /etc/apt/sources.list
.
apt update apt install libdvd-pkg
Answer the debconf questions, then run dpkg-reconfigure libdvd-pkg
.