Upgrading from an older samba4 installation. * Compile the new version of samba4 by following the HOWTO, but do not install it yet, and do not run provision. * Stop any samba process * Backup your samba4 provision: go into the directory where your samba4 provision is stored (/usr/local/samba by default) do tar cf $HOME/backup.tar private etc var sysvol * Go into the source4 dir * run ./scripting/bin/upgradeprovision -s * do make install This will do the minimum (safest) upgrade of the data. Runing upgradeprovision with --full will do a more comprehensive upgrade of the data (including schema and display specifiers). This attempts to do a new provision, and to then copy existing data into that database.