Ticketing System not working

Hi,

1) When I try and submit a ticket I get the following error: 500 Internal Server Error nginx

2) I recently setup a new Debian 8.1 server on linode. However trying to do an apt-get dist-upgrade or apt-get upgrade had no result. Trying apt-get install apache2 gave a very sparse result.

root@localhost:/etc/apt# apt-cache search apache2

gforge-web-apache2 - collaborative development tool - web part (using Apache)

gforge-web-apache2-vhosts - collaborative development tool - web vhosts (using Apache)

libapache-mod-jk-doc - Documentation of libapache2-mod-jk package

libapache2-mod-jk - Apache 2 connector for the Tomcat Java servlet engine

libapache2-mod-php5 - server-side, HTML-embedded scripting language (Apache 2 module)

libapache2-mod-php5filter - server-side, HTML-embedded scripting language (apache 2 filter module)

php5-cgi - server-side, HTML-embedded scripting language (CGI binary)

php5-fpm - server-side, HTML-embedded scripting language (FPM-CGI binary)

why ?