I have removed use_authtok from the sss file but there must be something wrong 
because I can't still change the password. I have followed the instructions 
here https://fedoraproject.org/wiki/How_to_debug_SSSD_problems to enable 
sssd_pam debug and it seems to be doing the same thing:
(Tue May 15 10:31:07 2012) [sssd[pam]] [accept_fd_handler] (0x0100): Client 
(Tue May 15 10:31:07 2012) [sssd[pam]] [sss_cmd_get_version] (0x0200): Received 
client version [3].
(Tue May 15 10:31:07 2012) [sssd[pam]] [sss_cmd_get_version] (0x0200): Offered 
version [3].
(Tue May 15 10:31:07 2012) [sssd[pam]] [pam_cmd_chauthtok_prelim] (0x0100): 
entering pam_cmd_chauthtok_prelim
(Tue May 15 10:31:07 2012) [sssd[pam]] [pam_print_data] (0x0100): command: 
(Tue May 15 10:31:07 2012) [sssd[pam]] [pam_print_data] (0x0100): domain: (null)
(Tue May 15 10:31:07 2012) [sssd[pam]] [pam_print_data] (0x0100): user: 

perhaps some other option must be changed in another place. installing
libpam-cracklib didn't solve the problem also

the gdm integration problem was that when I tried to login to the system de 
display manager didn't let me choose other user apart from the local users of 
the system. this seems to be an ubuntu design decision which can be changed 
following the steps indicated here:

it would be nice that when joining a domain this would be automatically
changed because it's a bit obscure to find and if not done only lets the
system to be used in terminal mode

the solution of using networked homedirectories it's ok for me although
it would be good to have it solved

You received this bug notification because you are a member of FreeIPA,
which is subscribed to freeipa in Ubuntu.

  fail joining to a freeipa server with ipa-client-install

Status in FreeIPA packaging for Ubuntu:
Status in “freeipa” package in Ubuntu:

Bug description:
  I try to join a freeipa domain and it seems there is some problem with the 
tls negotiacion. this is the log:
  pasqual@ubuntuprovesfreeipa:~$ sudo ipa-client-install -d --enable-dns-updates
  [sudo] password for pasqual: 
  root        : DEBUG    /usr/sbin/ipa-client-install was invoked with options: 
{'conf_ntp': True, 'domain': None, 'uninstall': False, 'force': False, 'sssd': 
True, 'krb5_offline_passwords': True, 'hostname': None, 'permit': False, 
'server': None, 'prompt_password': False, 'mkhomedir': False, 'dns_updates': 
True, 'preserve_sssd': False, 'debug': True, 'on_master': False, 'ntp_server': 
None, 'realm_name': None, 'unattended': None, 'principal': None}
  root        : DEBUG    missing options might be asked for interactively later

  root        : DEBUG    Loading Index file from 
  root        : DEBUG    Loading StateFile from 
  root        : DEBUG    [ipadnssearchldap(linux.gva.es)]
  root        : DEBUG    [ipadnssearchldap(gva.es)]
  root        : DEBUG    [ipadnssearchldap(es)]
  root        : DEBUG    [ipadnssearchldap(linux.gva.es)]
  root        : DEBUG    [ipadnssearchldap(gva.es)]
  root        : DEBUG    [ipadnssearchldap(es)]
  root        : DEBUG    Domain not found
  DNS discovery failed to determine your DNS domain
  Provide the domain name of your IPA server (ex: example.com): linux.gva.es
  root        : DEBUG    will use domain: linux.gva.es

  root        : DEBUG    [ipadnssearchldap]
  root        : DEBUG    IPA Server not found
  DNS discovery failed to find the IPA Server
  Provide your IPA server name (ex: ipa.example.com): freeipaserver.linux.gva.es
  root        : DEBUG    will use server: freeipaserver.linux.gva.es

  root        : DEBUG    [ipadnssearchkrb]
  root        : DEBUG    [ipacheckldap]
  root        : DEBUG    args=/usr/bin/wget -O /tmp/tmpWptXwb/ca.crt -T 15 -t 2 
  root        : DEBUG    stdout=
  root        : DEBUG    stderr=--2012-05-11 12:06:09--  
  Resolent freeipaserver.linux.gva.es (freeipaserver.linux.gva.es)...
  S'està connectant a freeipaserver.linux.gva.es 
(freeipaserver.linux.gva.es)||:80... conectat.
  HTTP: Petició enviada, esperant resposta... 200 OK
  Longitud: 1325 (1.3K) [application/x-x509-ca-cert]
  S'està desant a: «/tmp/tmpWptXwb/ca.crt»

       0K .                                                     100%

  2012-05-11 12:06:09 (38.4 MB/s) - s'ha desat «/tmp/tmpWptXwb/ca.crt»

  root        : DEBUG    Init ldap with: ldap://freeipaserver.linux.gva.es:389
  root        : ERROR    LDAP Error: Connect error: A TLS packet with 
unexpected length was received.
  Failed to verify that freeipaserver.linux.gva.es is an IPA Server.
  This may mean that the remote server is not up or is not reachable
  due to network or firewall settings.
  Installation failed. Rolling back changes.
  IPA client is not configured on this system.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: freeipa-client 2.1.4-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic-pae 3.2.14
  Uname: Linux 3.2.0-24-generic-pae i686
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: i386
  Date: Fri May 11 12:07:16 2012
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 
  SourcePackage: freeipa
  UpgradeStatus: No upgrade log present (probably fresh install)

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