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In Debian Edu context the main criticism since the release of Debian Edu / Skolelinux squeeze is: the whole Debian Edu system has become far to complex (LDAP, Kerberos, GOsa², Samba, LTSP, …). The default Skolelinux system has become more complex. If it has become too complex is another discussion.
However, those who feel overwhelmed by its grown complexity, please consider this approach:
adduser) or through some fancy user administration GUI (present in KDE / GNOME)
x2goserver-fmbindingson the Skolelinux machine. Optionally, you may want to install the package
x2gothinclient_managementon the Skolelinux system
… is a Debian Edu / Skolelinux based class room that can be administrated by normal Linux user and group administration tools. No Kerberos, no LDAP, no Samba, no XXX involved.