When I install Squid using
sudo apt-get install squid this message came:
Reading package lists... Done Building dependency tree Reading state information... Done Package squid is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'squid' has no installation candidate
I try to upgrade after 55% it failed:
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-backports/restricted/binary-i386/Packages 404 Not Found [IP: 126.96.36.199 80]
How can I solve this?