I have recently installed LMDE (Linux Mint Debian Edition) onto my laptop but I can't isntall anything because it can't find the sources. I'm assuming I need to edit the /etc/apt/sources.list file but I'm not sure. And if so I don't know in what way I should edit the file.

If it's a clean install, you should already have your default sources set to go.

I would check the basics:
Do you have intenet connectivity? Try pinging
Do you have working DNS? Try pinging www.google.com, does it resolve?
What does apt-get update return?

The internet connection was always working fine. Don't know why but now it's working. Go figure.

They've chagned the site. How do I mark solved?

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