My Ubuntu 12.04 update manager is unable to connect to the internet.
I was able to download updates a month back with my older internet connection.
Now with my new internet connection , I am able to browse internet/download using Firefox, but I'm unable to download Ubuntu updates.
sudo apt-get update
gives:
Err http://extras.ubuntu.com precise Release.gpg
Connection failed
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/precise-updates/universe/i18n/Translation-en Connection failed
E: Some index files failed to download. They have been ignored, or old ones used instead.