I recently installed the Ubuntu 12.10 server version from a USB flash drive. The step "Install additional software" or whatever kept on failing, so I ignored it and continued. Everything else worked like a charm.
It turns out, the only two entries in my sources.list are the install CD. This means that I have no way of getting anything installed.
Can someone give me a short list of repositories that I need so I can add them to the sources.list file? And on a similar note: What is the comment character for the sources list? #?