This bug affects me as well. Thought it might have been an old config causing problems, so I tried to autoremove and purge it. Same issue:
$ sudo apt-get autoremove --purge samba4 Reading package lists... Done Building dependency tree Reading state information... Done The following packages will be REMOVED: python-dnspython* python-ldb* python-samba* python-tdb* samba4* samba4-common-bin* 0 upgraded, 0 newly installed, 6 to remove and 0 not upgraded. 1 not fully installed or removed. After this operation, 18.9 MB disk space will be freed. Do you want to continue [Y/n]? (Reading database ... 337633 files and directories currently installed.) Removing samba4 ... * Stopping Samba 4 daemon samba [ OK ] Purging configuration files for samba4 ... Removing python-dnspython ... Removing samba4-common-bin ... Removing python-samba ... Removing python-ldb ... Purging configuration files for python-ldb ... Removing python-tdb ... Processing triggers for ureadahead ... Processing triggers for man-db ... Processing triggers for python-support ... Processing triggers for libc-bin ... ldconfig deferred processing now taking place $ sudo aptitude install samba4 The following NEW packages will be installed: python-dnspython{a} python-ldb{a} python-samba{a} python-tdb{a} samba4 samba4-common-bin{a} 0 packages upgraded, 6 newly installed, 0 to remove and 0 not upgraded. Need to get 0 B/3,019 kB of archives. After unpacking 18.9 MB will be used. Do you want to continue? [Y/n/?] Preconfiguring packages ... Selecting previously deselected package python-dnspython. (Reading database ... 337257 files and directories currently installed.) Unpacking python-dnspython (from .../python-dnspython_1.9.4-0ubuntu1_all.deb) ... Selecting previously deselected package python-ldb. Unpacking python-ldb (from .../python-ldb_1%3a1.0.1~git20120220-1_amd64.deb) ... Selecting previously deselected package python-tdb. Unpacking python-tdb (from .../python-tdb_1.2.9-1fakesync1_amd64.deb) ... Selecting previously deselected package python-samba. Unpacking python-samba (from .../python-samba_4.0.0~alpha15~git20110124.dfsg1-2ubuntu1_amd64.deb) ... Selecting previously deselected package samba4-common-bin. Unpacking samba4-common-bin (from .../samba4-common-bin_4.0.0~alpha15~git20110124.dfsg1-2ubuntu1_all.deb) ... Selecting previously deselected package samba4. Unpacking samba4 (from .../samba4_4.0.0~alpha15~git20110124.dfsg1-2ubuntu1_amd64.deb) ... Processing triggers for man-db ... Processing triggers for ureadahead ... Setting up python-dnspython (1.9.4-0ubuntu1) ... Setting up python-ldb (1:1.0.1~git20120220-1) ... Setting up python-tdb (1.2.9-1fakesync1) ... Setting up python-samba (4.0.0~alpha15~git20110124.dfsg1-2ubuntu1) ... Processing triggers for python-central ... Setting up samba4-common-bin (4.0.0~alpha15~git20110124.dfsg1-2ubuntu1) ... Setting up samba4 (4.0.0~alpha15~git20110124.dfsg1-2ubuntu1) ... * Starting Samba 4 daemon samba Unknown parameter encountered: "max log size" Ignoring unknown parameter "max log size" Unknown parameter encountered: "syslog" Ignoring unknown parameter "syslog" Unknown parameter encountered: "passdb backend" Ignoring unknown parameter "passdb backend" Unknown parameter encountered: "unix password sync" Ignoring unknown parameter "unix password sync" Unknown parameter encountered: "passwd program" Ignoring unknown parameter "passwd program" Unknown parameter encountered: "pam password change" Ignoring unknown parameter "pam password change" Unknown parameter encountered: "map to guest" Ignoring unknown parameter "map to guest" Unknown parameter encountered: "usershare allow guests" Ignoring unknown parameter "usershare allow guests" Unknown parameter encountered: "guest ok" Ignoring unknown parameter "guest ok" Unknown parameter encountered: "guest ok" Ignoring unknown parameter "guest ok" Unknown parameter encountered: "valid users" Ignoring unknown parameter "valid users" Unknown parameter encountered: "valid users" Ignoring unknown parameter "valid users" Unknown parameter encountered: "valid users" Ignoring unknown parameter "valid users" [Sat Apr 16 14:46:55 2011 EDT, 0 ../smbd/server.c:367:binary_smbd_main()] samba version 4.0.0alpha15-UNKNOWN started. Copyright Andrew Tridgell and the Samba Team 1992-2011 [ OK ] Processing triggers for python-support ... ldb: unable to stat module /usr/lib/samba/ldb/modules/samba : No such file or directory ldb: failed to initialise module /usr/lib/samba/ldb/modules/samba : Unavailable ldb: failed to initialise module /usr/lib/samba/ldb/modules : Unavailable Processing triggers for libc-bin ... ldconfig deferred processing now taking place -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/732071 Title: samba4: unable to find ldb modules -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs