MariaDB couldn't install correctly under fedora 17 with latest updates

1. cat /etc/yum.repos.d/MariaDB.repo
2. MariaDB repository list - created 2012-08-20 16:03 UTC
3. http://downloads.mariadb.org/mariadb/repositories/
   [mariadb]
   name = MariaDB
   baseurl = http://yum.mariadb.org/5.5/fedora16-x86
   gpgcheck=1

1. yum install MariaDB-server
   Loaded plugins: langpacks, presto, refresh-packagekit
   Resolving Dependencies
   --> Running transaction check
   ---> Package MariaDB-server.i686 0:5.5.25-1 will be installed
   --> Processing Dependency: MariaDB-common for package: MariaDB-server-5.5.25-1.i686
   --> Running transaction check
   ---> Package MariaDB-common.i686 0:5.5.25-1 will be installed
   --> Finished Dependency Resolution

Dependencies Resolved

=========================================================================================================================================================================================
Package Arch Version Repository Size
=========================================================================================================================================================================================
Installing:
MariaDB-server i686 5.5.25-1 mariadb 32 M
Installing for dependencies:
MariaDB-common i686 5.5.25-1 mariadb 23 k

Transaction Summary
=========================================================================================================================================================================================
Install 1 Package (+1 Dependent package)

Total download size: 32 M
Installed size: 129 M
Is this ok [y/N]: y
Downloading Packages:
(1/2): MariaDB-5.5.25-fedora16-i686-common.rpm | 23 kB 00:00
(2/2): MariaDB-5.5.25-fedora16-i686-server.rpm | 32 MB 00:11
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 2.9 MB/s | 32 MB 00:11
Running Transaction Check
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : MariaDB-common-5.5.25-1.i686 1/2
Installing : MariaDB-server-5.5.25-1.i686 2/2
chown: invalid user: `mysql:mysql'
chown: invalid user: `mysql'
Cannot change ownership of the database directories to the 'mysql'
user. Check that you have the necessary permissions and try again.
chown: invalid user: `mysql:mysql'
Verifying : MariaDB-server-5.5.25-1.i686 1/2
Verifying : MariaDB-common-5.5.25-1.i686 2/2

Installed:
MariaDB-server.i686 0:5.5.25-1

Dependency Installed:
MariaDB-common.i686 0:5.5.25-1

Complete!

1. service mysql restart
   MySQL server PID file could not be found! [FAILED]
   Starting MySQL.The server quit without updating PID file (/[FAILED]mysql/u3s3.pid).

1. ls -la /var/lib/mysql
   total 20
   drwxr-xr-x. 4 root root 4096 сент. 2 15:08 .
   drwxr-xr-x. 42 root root 4096 сент. 2 14:33 ..
   drwx-x-x. 2 root root 4096 сент. 2 14:33 mysql
   drwxr-xr-x. 2 root root 4096 сент. 2 14:33 test
   rw-rw---. 1 root root 371 сент. 2 15:08 u3s3.err

1. cat /var/lib/mysql/u3s3.err
   120902 15:08:43 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
   120902 15:08:43 [ERROR] Fatal error: Can't change to run as user 'mysql' ; Please check that the user exists!

120902 15:08:43 [ERROR] Aborting

120902 15:08:43 [Note] /usr/sbin/mysqld: Shutdown complete

120902 15:08:43 mysqld_safe mysqld from pid file /var/lib/mysql/u3s3.pid ended

In /etc/passwd and /etc/group mysql is absent!!!