First I just tried to install a software:
sudo apt-get install xvfb
It returns:
Err http://br.archive.ubuntu.com/ubuntu/ raring-updates/main xvfb amd64 2:1.13.3-0ubuntu6.2
404 Not Found [IP: 200.236.31.4 80]
Err http://security.ubuntu.com/ubuntu/ raring-security/main xvfb amd64 2:1.13.3-0ubuntu6.2
404 Not Found [IP: 91.189.91.13 80]
Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/x/xorg-server/xvfb_1.13.3-0ubuntu6.2_amd64.deb 404 Not Found [IP: 91.189.91.13 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
I just ran apt-get update and it returns a lot of 404 not found repositories from this same IP.
So I tried to update my system:
sudo update-manager -d
But it returns:
Failed to load repository information, check your internet connection.
What should I do?
@mchid suggestion worked. I ran the command:
And I was able to update my Ubuntu from 13.04 to 13.10. Since 13.10 is not LTS and there is no Ubuntu 13 LTS version I don't know how long this is going to work :)