Upgrade to12 issue

[unabletosync]

I am a complete nube to Unbuntu. When I downloaded the upgrade to v.12 it went through all of the steps fine, no errors during, but when restarting it stops booting at the Ubuntu title screen and will not go any further.
I don't want to make things worse... Anyone have a solution?

[josephmills]

After the title screen goes away can you press ctrl+alt+f1
then log in. (if you can)
then type in

sudo apt-get install pastebinit
then you are going to use pastebinit to paste some output so we can see what is going on with you computer. When using pastebinit it will return a link You are going to want to write down each link so that you can Put them here for us to see.

so after logged in (again if you can with ctrl+alt+f1) Please enter in these commands and save the link that is outputted to you thanks

lspci -vnn | pastebinit

lsmod | pastebinit

then put the links here for se to do some debugging work. Thanks

[unabletosync]

Well, I just bought this computer used and I do not know the login.
It is a Dell Inspiron 1526.

Above the login prompt there is "Ubuntu 12.04.1 LTS dell-laptop ttyl", if that helps...

[unabletosync]

Got in!
Entered the sudo apt command, then confirmed Y to install new packages then this:

Err http:us.archive.ubuntu.com/ubuntu/ precise/main python-cionfigobj all 4.7.2+ds-3build1
Could not resolve 'us.archive.ubuntu.com'

then goes on to list a long Failed to Fetch script.