Hi guys, I tried searching on the forum but I've seen anything. I have a problem during installation of Mobile Joomla. After I load the package I get an error: 
Errore HTTP 500 (Internal Server Error) An unexpected condition has occurred while the server was attempting to fulfill the request.

System Information
Linux srvispcfg1.interfree.it 2.6.18-194.32.1.el5 #1 SMP Wed Jan 5 17:53:09 EST 2011 i686
PHP: 5.3.5
Webserver: Apache/2.2.3 (CentOS)
Joomla! 2.5.8 Stable [ Ember ] 8-November-2012 14:00 GMT
Joomla Platform 11.4.0 Stable [ Brian Kernighan ] 03-Jan-2012 00:00 GMT

Any solutions? Thanks

Usually #500 error is accompanied by corresponding record in one of error log (php's log if error comes from php, or server's log in the case webserver error).

Where I can find these files log?

It depends. Usually it is in one of:
- parent directory of website root
- /path_to_apache/apache/logs
- /var/log/httpd/error_log

but actually it may be anywhere.

I found this

[Fri Jan 25 15:10:13 2013] [error]  PHP Fatal error:  Maximum execution time of 30 seconds exceeded in /var/www/clients/client475/web503/web/web/libraries/joomla/filesystem/archive/tar.php on line 159, referer: www.**********************.it/web/administrator/index.php?option=com_installer

Try to unpack MJ installation archive, upload it to the server (e.g. to joomla's tmp directory) and install using "Install from directory" method.

Thank you dryabov! Mission accomplished!