Internal Server Error when installing Joomla Extension

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installation of any new extension show internal server error in both joomla 2.5 and 3.0. Also the system information in joomla back end , under control panel show like this.

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, [email protected] and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Hello akosite, Thank you for your question. If you are getting Internal Server, and 404 errors, it is often related to Folder permissions, or something within the .htaccess file is interfering with the site loading. I found this information on the Official Joomla Forum, I recommend reading that forum post, as it provides several solutions. If you have any further questions, feel free to post them below. Thank you, -John-Paul