[falko]

Originally Posted by PermaNoob

Failed to fetch http://security.ubuntu.com/ubuntu/po...tu3.3_i386.deb 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/po...tu3.3_i386.deb 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/po...tu3.3_i386.deb 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/po...ntu3.3_all.deb 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/po...ntu3.3_all.deb 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/po...tu3.3_i386.deb 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/po...tu3.3_i386.deb 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/po...tu3.3_i386.deb 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/po...tu3.3_i386.deb 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/po...tu3.3_i386.deb 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/po...tu3.3_i386.deb 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/po...tu3.3_i386.deb 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/po...tu3.3_i386.deb 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/po...tu3.3_i386.deb 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/po...tu3.3_i386.deb 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/po...tu3.3_i386.deb 404 Not Found
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

This sounds like a temporary error to me. You should try again later.

Regarding the missing packages: make sure your sources.list looks like the one from the tutorial. Run

apt-get update

after any modification to your sources.list.
If the packages still can't be found, then it's possible Ubuntu removed them from the repositories. But they are not that important, you can continue without them.