Error while am try to update it

Question

W:Failed to fetch http://ppa.launchpad.net/plushuang-tw/uget-stable/ubuntu/dists/saucy/main/binary-i386/Packages 404 Not Found , E:Some index files failed to download. They have been ignored, or old ones used instead.

Answer 1

run these commands in terminal,

sudo apt-get update
sudo apt-get -f install

And also check your internet connection.