I can not install anything on joomla 2.5. - Joomla! Forum - community, help and support

i can not install on joomla 2.5. called debugger , returns error:

jdatabasemysql::query: 2006 - mysql server has gone away sql=show full columns `r20ic_extensions`
call stack
# function location
1 jadministrator->dispatch() jroot\administrator\index.php:46
2 jcomponenthelper::rendercomponent() jroot\administrator\includes\application.php:153
3 jcomponenthelper::executecomponent() jroot\libraries\joomla\application\component\helper.php:348
4 require_once() jroot\libraries\joomla\application\component\helper.php:380
5 jcontroller->execute() jroot\administrator\components\com_installer\installer.php:18
6 installercontrollerinstall->install() jroot\libraries\joomla\application\component\controller.php:761
7 installermodelinstall->install() jroot\administrator\components\com_installer\controllers\install.php:29
8 jinstaller->install() jroot\administrator\components\com_installer\models\install.php:105
9 jinstallertemplate->install() jroot\libraries\joomla\installer\installer.php:472
10 jtable::getinstance() jroot\libraries\joomla\installer\adapters\template.php:253
11 jtableextension->__construct() jroot\libraries\joomla\database\table.php:196
12 jtable->__construct() jroot\libraries\joomla\database\table\extension.php:33
13 jtable->getfields() jroot\libraries\joomla\database\table.php:92
14 jdatabasemysql->gettablecolumns() jroot\libraries\joomla\database\table.php:132
15 jdatabase->loadobjectlist() jroot\libraries\joomla\database\database\mysql.php:370
16 jdatabasemysql->execute() jroot\libraries\joomla\database\database.php:1126
17 jerror::raiseerror() jroot\libraries\joomla\database\database\mysql.php:548
18 jerror::raise() jroot\libraries\joomla\error\error.php:251

does know how can solve problem?

google: "mysql server has gone away"