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Grub2 has been the default boot loader for Ubuntu for more then 10 years now. Its configuration file is nowadays /boot/grub/grub.cfg, but you MUST NOT edit /boot/grub/grub.cfg in order to modify the Grub boot menu.
Instead, you need to add your own entries to the file /etc/grub.d/40_custom. Some general preferences are also set in the the file /etc/default/grub and any file under /etc/default/grub.d/.

Apache forward proxy

How to install a forward proxy:

  1. In a typical multi-host environment, you need to add a virtual server to the apache configuration. In order to do that, add a file (e.g. ForwardProxy.conf) to the sites-available directory. This file must contain the following configuration lines for the proxy to listen on port 8080:

    ProxyRequests On
    ProxyVia On

    Require ip 192.168

    ErrorLog /var/log/apache2/error_ForwardProxy.log
    CustomLog /var/log/apache2/access_ForwardProxy.log combined