I am not able to install it got permissions error after provideing permission from command prompt the error is same.
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 SELinux? 
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 Those instructions doesn't include configuring SELinux. https://mangolassi.it/post/245962 
 chcon -t httpd_sys_rw_content_t /var/www/html/helpdesk -R
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 Did that work for you @adamnic 


