From your ubuntu machine, even a desktop machine run this command from a terminal window:
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sudo apt-get install squid
once this is installed, edit the following file and declare your internal network:
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vi /etc/squid/squid.conf
add these lines
The first line state your network range as a source (my current network is 192.168.1.0 / Netmask 255.255.255.0)
Tag: acl
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acl my_network src 192.168.1.0/24
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http_access allow my_network
Now, restart the squid deamon running the command:
service squid restart
More info on the squid settings that could be used/applied:http://www.squid-cache.org/