Applications which were installed from the Univention App Center need to be updated before the release update. If e.g. the error message Further release updates are available but cannot be installed because the component 'zarafa_20130228' is not available for newer release versions is displayed, the installed application (in this example Zarafa) must be updated in the Univention App Center using Upgrade before the release update can be initiated.

As of UCS 3.2, the univention-mail-cyrus package includes a new Univention Configuration Registry template for the configuration file of the Cyrus BDB database (/var/lib/cyrus/db/DB_CONFIG).

The default values of the UCR variables for the configuration of the BDB database are:

Any existing Cyrus BDB configuration will be copied to /var/lib/cyrus/db/DB_CONFIG.debian during the update. If the new default values do not correspond to the old, existing configuration or if the used options are not available in the new default values, the corresponding Univention Configuration Registry variables should be set prior to the update. E.g.:

ucr set mail/cyrus/bdb/dbconfig/set_cachesize="0 4097152 1"
ucr set mail/cyrus/bdb/dbconfig/set_lg_regionmax="2097152"
ucr set mail/cyrus/bdb/dbconfig/set_lg_max="1048576"

The listener module for the administration of mailboxes has been revised. Mailboxes are now only created if the mailHomeServer attribute is set for the user (in the UMC under Advanced settings -> Mail home server ).

If the mail/cyrus/mailbox/delete Univention Configuration Registry variable has been activated on the mail server and the attribute is removed from the user object, the mailbox is deleted.

Some components have been removed and are no longer provided with UCS 3.2:

Starting with UCS 3.0, in a new installation, the Univention Installer writes GRUB 2 in the boot sector directly.

In an updated system, GRUB 1 remains installed in the master boot record (MBR). Grub 2 sets up a "Chainload into GRUB" entry, which then loads the actual GRUB 2.

Documentation explaining how to write GRUB 2 directly in the MBR on updated systems is provided in the Univention Support Database (http://sdb.univention.de/1218).

As of UCS 3.0, PostgreSQL 8.4 is also available in addition to PostgreSQL 8.3. When systems with PostgreSQL 8.3 are updated to UCS 3.0, however, the installed PostgreSQL version is retained.

The update to PostgreSQL 8.4 is described in the SDB article http://sdb.univention.de/1249.

As of UCS 3.2, the Horde Groupware Webmail Edition will no longer be available via the univention-horde4 package and will be provided instead via the Univention App Center. The update of univention-horde4 to or initial installation of Horde 5.1.0 is performed by installing the Horde Groupware Webmail Edition app in the Univention App Center.

In versions before UCS 3.2, Samba used the CIFS protocol to provide file services. In new installations as of UCS 3.2, the successor SMB2 is enabled as standard. Using a client which supports SMB2 (as of Windows Vista, i.e., Windows 7/8 too) improves the performance and scalability.

In the case of updates from earlier UCS releases, Samba continues to use CIFS. To enable the use of SMB2 subsequently, the Univention Configuration Registry variable samba/max/protocol must be set to SMB2 on all Samba servers and the Samba server(s) restarted.

Pre-up and postup scripts are scripts which are run before and after release updates (e.g., for post-processing the update, for example by uninstalling obsolete packages). As of UCS 3.2, these scripts are cryptographically signed to prevent unauthorized modification. During the update and when mirroring the repository these signatures are checked. If they're invalid or missing, the action is aborted.

If a repository server is operated with UCS 3.1-x, it should be updated to UCS 3.2 before additional systems can be updated to UCS 3.2-1.

If it is not possible to update the repository server, the signature files must be downloaded manually:

LOCAL_DIR="/var/lib//univention-repository/mirror"
SERVER="http://updates.software-univention.de"
for release in 3.2-0 3.2-1; do
  for script in preup postup; do
    file="3.2/maintained/$release/all/$script.sh.gpg"
    wget -O "$LOCAL_DIR/$file" "$SERVER/$file"
  done
done

Alternatively, it is also possible to disable the signature checks, which can be a security risk. For the repository server this can be done by setting the Univention Configuration Registry variable repository/mirror/verify to false. For the update the Univention Configuration Registry variable repository/online/verify must be set to false on all systems.

In new installations as of UCS 3.2 in which Samba 4 is used, the group memberships are synchronised between the Samba 4 directory service and the OpenLDAP directory service by the Univention S4 connector, i.e., each group on the UCS side is associated with a group in Active Directory.

Systems installed with earlier UCS versions than 3.2 can optionally to be changed over subsequently. Further information can be found at http://sdb.univention.de/1238.

In earlier UCS versions, the UCS start page could be expanded with Univention Configuration Registry templates in the /etc/univention/templates/files/var/www/ucs-overview directory. As of UCS 3.2, the start page is expanded with Univention Configuration Registry variables (ucs/web/overview/entries/*, further information can be found in the UCR variable descriptions). Any existing expansions must therefore be migrated manually.

Anonymous usage statistics on the use of the Univention Management Console are collected when using the free for personal use version of UCS (which is generally used for evaluating UCS). The modules opened are logged in an instance of the web traffic analysis tool Piwik. This makes it possible for Univention to tailor the development of the Univention Management Console better to customer needs and carry out usability improvements.

This logging is only performed when the free-for-personal-use license is used. The license status can be verified by clicking on the cog symbol in the top righthand corner of the Univention Management Console and selecting License information. If Free for personal use edition is listed under LDAP base, this version is in use. When a regular UCS license is used, no usage statistics are collected.

Indendepent of the licence used, the statistics generation can be deactivated by setting the Univention Configuration Registry variable umc/web/piwik to false.

Starting with UCS 3.1, in addition to the standard installation DVD there is also a medium with support for the Unified Extensible Firmware Interface standard (UEFI) available for the amd64 architecture.

It can be used instead of the standard DVD on systems which only support a UEFI boot.

Webkit, Konqueror and QtWebkit are shipped in the maintained branch of the UCS repository, but not covered with security support. Webkit is primarily used for displaying HTML help pages etc. Firefox should be used as the web browser.

Univention Management Console uses numerous Javascript and CSS functions to display the web interface. Cookies need to be permitted in the browser. The following browsers are recommended:

Users with older browsers may experience display or performance problems.

The versions of Samba 4 currently published by the Samba project are undergoing more intensive changes in their further development than Samba 3. For this reason, some functions are not yet completely available:

Further information can be found in Chapter 8 of the UCS manual [UCS-Handbuch].

During the installation of UCS in the virtualization solution VirtualBox, a VirtualBox bug may appear which has been corrected in version 4.2: if UCS has been successfully installed and the DVD is still in the disk drive, the installation DVD offers the option Boot from first harddisk partition. If you select this option, VirtualBox freezes.

For Linux distributions which still use Virtualbox 4.0 or 4.1, either the installation DVD can be taken out of the drive settings of the VirtualBox VM or F12 pressed when starting the virtual instance and the hard drive selected as a boot partition as a workaround before starting the UCS VM. UCS will then start successfully.

When UCS is installed in the virtualization solution Citrix XenServer 6.0 - 6.2, the Grub menu of the Univention installer is not shown with the Cirrus graphics card emulated as standard. The Univention Installer can be started directly by pressing the ENTER key; alternatively, the installation starts automatically after sixty seconds. The Univention Installer which then starts is displayed as normal.

To display Grub correctly, the graphics card emulated by XenServer can be reconfigured. This is done by logging on to the XenServer system as the root user. Firstly, the xe vm-list command is used to determine the UUID of the virtual machine. The following command is then used to reconfigure the emulated graphics card to VGA:

xe vm-param-set uuid=UUIDVM platform:vga=std

There are two basic procedures for migrating Samba 3 to Samba 4:

Both procedures are documented in detail in the Univention Wiki: http://wiki.univention.de/index.php?title=Migration_from_Samba_3_to_Samba_4.

If the Xen hypervisor is used and the memory limit for the Dom0 has been configured using the Univention Configuration Registry-Variable grub/xenhopt, the value should be updated to include the ,max: part as well. See the http://wiki.univention.de/index.php?title=UVMM_Quickstart-3.1/en#Configuring_the_Dom0 for details.