I just installed Ubuntu 12.10, and can't install build-essential or git.
I had internet on and checked both options, to install 3rd party and to download updates while installing.
sudo apt-get update says:
E: Some index files failed to download. They have been ignored, or old ones used instead.
carmen@SERENITY:~$ sudo apt-get install build-essential git subversion
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package build-essential
E: Unable to locate package git
E: Unable to locate package subversion
How am I supposed to use Ubuntu now?