apt-get update: (101 Network is Unreachable)

[Joseph Linkous]

It seems almost everyone's gotten this error at one point or another, with
the sheer number of threads about it as evidence. The issue is there's many
causes of and solutions to this problem. Being the noob that I am, I started
opening .conf files here and deleting lines there, and not only have I not
found the solution yet, but now I've got a bunch of files which probably
don't work anymore. There's something to be said about making backups when
you don't know what you're doing, that's for sure.

Since this is my first time setting up a Linux server and I'm not really
making use of it at the moment, I want to run BOINC. However, my screen is
being flooded by errors like this:

Err http://us.archive.ubuntu.com intrepid-updates/main Sources
  Cannot initiate the connection to us.archive.ubuntu.com:80 (91.189.88.45).
- connect (101 Network is unreachable) [IP: 91.189.88.45 80]
W: Failed to fetch
http://us.archive.ubuntu.com/ubuntu/dists/intrepid-updates/universe/binary-i386/Packages.gz
Cannot initiate the connection to us.archive.ubuntu.com:80 (91.189.88.45). -
connect (101 Network is unreachable) [IP: 91.189.88.45 80]

I was working on it all morning, but I honestly couldn't give you guys a
list of everything I changed to try to get this working.

What are your thoughts, all? I'm pretty new at this, but I feel it will be
worth the effort (and fun!) to learn Ubuntu Server.

<Insert 'boohoo I'm going back to Windoze' here>
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