After installing the latest Steam client ( http://store.steampowered.com/ ) on my Ubuntu 14.04 using the Ubuntu Software Center, I decided to install another package using the package manager. As a first step I ran apt-get update , which (you guessed correctly) failed fetching several index files: Err https://private-ppa.launchpad.net precise/main amd64 Packages HttpError401 Err https://private-ppa.launchpad.net precise/main i386 Packages HttpError401 Ign https://private-ppa.launchpad.net precise/main Translation-en_US Ign http://security.ubuntu.com trusty-security/main Translation-en_US ..... ... W: Failed to fetch https://private-ppa.launchpad.net/commercial-ppa-uploaders/steam/ubuntu/dists/precise/main/binary-amd64/Packages HttpError401 W: Failed to fetch https://private-ppa.launchpad.net/commercial-ppa-uploaders/steam/ubuntu/dists/precise/main/binary-i386/Packages HttpError401 E: Some index files failed to download. They have