Preparing to unpack .../libpam-smbpass_2%3a4.1.6+dfsg-1ubuntu2.14.04.12_amd64.deb ...
passdb.tdb exists in /var/lib/samba and /var/lib/samba/private, aborting libpam-smbpass preinst
rename one of them to allow the install/upgrade to continue
http://bugs.debian.org/726472
/var/lib/samba:
total 328
drwxr-xr-x  9 root root         4096 Feb 27 00:00 .
drwxr-xr-x 74 root root         4096 Dec 29 11:26 ..
-rw-------  1 root root        36864 Apr 30  2012 account_policy.tdb
-rw-------  1 root root          696 Apr 30  2012 group_mapping.tdb
drwxr-xr-x  2 root root         4096 Apr 30  2012 netlogon
-rw-------  1 root root        36864 Jan 21 08:52 passdb.tdb
drwxr-xr-x 10 root root         4096 May 20  2012 printers
drwxr-xr-x  3 root root         4096 Oct 17 07:35 private
drwxr-xr-t  4 root root         4096 Apr 30  2012 profiles
-rw-------  1 root root       106496 Sep 18  2014 registry.tdb
drwxr-xr-x  2 root root         4096 Apr 30  2012 root
-rw-------  1 root root        45056 Apr 30  2012 secrets.tdb
-rw-------  1 root root        36864 Nov 30 23:34 share_info.tdb
drwxrwx--T  2 root sambashare   4096 Nov 30 23:06 usershares
-rw-------  1 root root        32768 Mar  4 11:01 winbindd_cache.tdb
drwxr-x---  2 root root         4096 Feb 27 00:00 winbindd_privileged

/var/lib/samba/private:
total 96
drwxr-xr-x 3 root root  4096 Oct 17 07:35 .
drwxr-xr-x 9 root root  4096 Feb 27 00:00 ..
-rw------- 1 root root 36864 Mar  4 11:10 passdb.tdb
-rw------- 1 root root   696 Sep 18  2014 randseed.tdb
-rw------- 1 root root 45056 Apr 30  2012 secrets.tdb
drwxr-xr-x 2 root root  4096 Sep 18  2014 smbd.tmp