cannot connect to internet with ubuntu?

[adaviel]

Tor runs on top of a normal operating system.
First get Ubuntu running normally, on the internet.
Then install the regular Tor browser package and play with that.
Then try Truecrypt.
When you have all that working and are familiar with it, try the more complex double VM system in the tutorial.

I'm not familiar with Ubuntu. When you install RedHat/Fedora/CentOS, one of the install screens asks if you want to activate the network devices and asks if you want static addressing or DHCP. If you say DHCP (normal for most residential and corporate desktops and anything on wifi), then you should get a DHCP client running, which should assign you an IPv4 address automatically based on the DHCP server running at your ISP, or on your home router if you are using NAT.
I.e. "ps ax|grep dhc" should show dhclient or dhcpcd or something, and there should be entries in
/var/log/messages about addresses being assigned.
If you are not running a DHCP client, but you are supposed to be, you need to start it.
Network settings are in /etc/sysconfig/network-scripts/ifcfg-eth0 e.g.
BOOTPROTO="dhcp"
ONBOOT="yes"
but there's surely a GUI control to set it