root@david-Lenovo-Yoga-2-Pro:/# sudo apt-get update Ign http://us.archive.ubuntu.com trusty InRelease Ign http://security.ubuntu.com trusty-security InRelease Ign http://extras.ubuntu.com trusty InRelease Ign http://ppa.launchpad.net precise InRelease Ign http://us.archive.ubuntu.com trusty-updates InRelease Ign http://us.archive.ubuntu.com trusty-backports InRelease Hit http://security.ubuntu.com trusty-security Release.gpg Hit http://extras.ubuntu.com trusty Release.gpg Get:1 http://ppa.launchpad.net precise Release.gpg [316 B] Ign http://www.openfoam.org trusty InRelease Hit http://us.archive.ubuntu.com trusty Release.gpg Hit http://security.ubuntu.com trusty-security Release Hit http://extras.ubuntu.com trusty Release Get:2 http://us.archive.ubuntu.com trusty-updates Release.gpg [933 B] Hit http://ppa.launchpad.net precise Release Ign http://www.openfoam.org trusty Release.gpg Ign http://ppa.launchpad.net precise Release Hit http://us.archive.ubuntu.com trusty-backports Release.gpg Hit http://extras.ubuntu.com trusty/main Sources Hit http://security.ubuntu.com trusty-security/main Sources Ign http://ppa.launchpad.net precise/main Sources/DiffIndex Ign http://www.openfoam.org trusty Release Hit http://us.archive.ubuntu.com trusty Release Hit http://extras.ubuntu.com trusty/main amd64 Packages Hit http://security.ubuntu.com trusty-security/restricted Sources Ign http://ppa.launchpad.net precise/main amd64 Packages/DiffIndex Get:3 http://us.archive.ubuntu.com trusty-updates Release [63.5 kB] Ign http://www.openfoam.org trusty/main amd64 Packages/DiffIndex Hit http://extras.ubuntu.com trusty/main i386 Packages Hit http://security.ubuntu.com trusty-security/universe Sources Ign http://ppa.launchpad.net precise/main i386 Packages/DiffIndex Ign http://www.openfoam.org trusty/main i386 Packages/DiffIndex Hit http://security.ubuntu.com trusty-security/multiverse Sources Hit http://security.ubuntu.com trusty-security/main amd64 Packages Hit http://us.archive.ubuntu.com trusty-backports Release Hit http://ppa.launchpad.net precise/main Translation-en Hit http://us.archive.ubuntu.com trusty/main Sources Hit http://security.ubuntu.com trusty-security/restricted amd64 Packages Hit http://us.archive.ubuntu.com trusty/restricted Sources Hit http://ppa.launchpad.net precise/main Sources Hit http://us.archive.ubuntu.com trusty/universe Sources Hit http://security.ubuntu.com trusty-security/universe amd64 Packages Hit http://ppa.launchpad.net precise/main amd64 Packages Hit http://us.archive.ubuntu.com trusty/multiverse Sources Hit http://security.ubuntu.com trusty-security/multiverse amd64 Packages Hit http://ppa.launchpad.net precise/main i386 Packages Hit http://us.archive.ubuntu.com trusty/main amd64 Packages Hit http://security.ubuntu.com trusty-security/main i386 Packages Hit http://us.archive.ubuntu.com trusty/restricted amd64 Packages Hit http://security.ubuntu.com trusty-security/restricted i386 Packages Hit http://us.archive.ubuntu.com trusty/universe amd64 Packages Hit http://security.ubuntu.com trusty-security/universe i386 Packages Hit http://us.archive.ubuntu.com trusty/multiverse amd64 Packages Hit http://security.ubuntu.com trusty-security/multiverse i386 Packages Hit http://us.archive.ubuntu.com trusty/main i386 Packages Hit http://us.archive.ubuntu.com trusty/restricted i386 Packages Ign http://extras.ubuntu.com trusty/main Translation-en_US Hit http://security.ubuntu.com trusty-security/main Translation-en Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://extras.ubuntu.com trusty/main Translation-en Hit http://security.ubuntu.com trusty-security/multiverse Translation-en Hit http://us.archive.ubuntu.com trusty/universe i386 Packages Hit http://security.ubuntu.com trusty-security/restricted Translation-en Hit http://us.archive.ubuntu.com trusty/multiverse i386 Packages Hit http://us.archive.ubuntu.com trusty/main Translation-en Hit http://security.ubuntu.com trusty-security/universe Translation-en Hit http://us.archive.ubuntu.com trusty/multiverse Translation-en Hit http://www.openfoam.org trusty/main amd64 Packages Hit http://us.archive.ubuntu.com trusty/restricted Translation-en Hit http://www.openfoam.org trusty/main i386 Packages Hit http://us.archive.ubuntu.com trusty/universe Translation-en Get:4 http://us.archive.ubuntu.com trusty-updates/main Sources [206 kB] Ign http://www.openfoam.org trusty/main Translation-en_US Ign http://www.openfoam.org trusty/main Translation-en Get:5 http://us.archive.ubuntu.com trusty-updates/restricted Sources [3,433 B] Get:6 http://us.archive.ubuntu.com trusty-updates/universe Sources [118 kB] Get:7 http://us.archive.ubuntu.com trusty-updates/multiverse Sources [5,152 B] Get:8 http://us.archive.ubuntu.com trusty-updates/main amd64 Packages [506 kB] Get:9 http://us.archive.ubuntu.com trusty-updates/restricted amd64 Packages [11.8 kB] Get:10 http://us.archive.ubuntu.com trusty-updates/universe amd64 Packages [279 kB] Get:11 http://us.archive.ubuntu.com trusty-updates/multiverse amd64 Packages [11.9 kB] Get:12 http://us.archive.ubuntu.com trusty-updates/main i386 Packages [493 kB] Get:13 http://us.archive.ubuntu.com trusty-updates/restricted i386 Packages [11.8 kB] Get:14 http://us.archive.ubuntu.com trusty-updates/universe i386 Packages [280 kB] Get:15 http://us.archive.ubuntu.com trusty-updates/multiverse i386 Packages [12.1 kB] Hit http://us.archive.ubuntu.com trusty-updates/main Translation-en Hit http://us.archive.ubuntu.com trusty-updates/multiverse Translation-en Hit http://us.archive.ubuntu.com trusty-updates/restricted Translation-en Hit http://us.archive.ubuntu.com trusty-updates/universe Translation-en Hit http://us.archive.ubuntu.com trusty-backports/main Sources Hit http://us.archive.ubuntu.com trusty-backports/restricted Sources Hit http://us.archive.ubuntu.com trusty-backports/universe Sources Hit http://us.archive.ubuntu.com trusty-backports/multiverse Sources Hit http://us.archive.ubuntu.com trusty-backports/main amd64 Packages Hit http://us.archive.ubuntu.com trusty-backports/restricted amd64 Packages Hit http://us.archive.ubuntu.com trusty-backports/universe amd64 Packages Hit http://us.archive.ubuntu.com trusty-backports/multiverse amd64 Packages Hit http://us.archive.ubuntu.com trusty-backports/main i386 Packages Hit http://us.archive.ubuntu.com trusty-backports/restricted i386 Packages Hit http://us.archive.ubuntu.com trusty-backports/universe i386 Packages Hit http://us.archive.ubuntu.com trusty-backports/multiverse i386 Packages Hit http://us.archive.ubuntu.com trusty-backports/main Translation-en Hit http://us.archive.ubuntu.com trusty-backports/multiverse Translation-en Hit http://us.archive.ubuntu.com trusty-backports/restricted Translation-en Hit http://us.archive.ubuntu.com trusty-backports/universe Translation-en Ign http://us.archive.ubuntu.com trusty/main Translation-en_US Ign http://us.archive.ubuntu.com trusty/multiverse Translation-en_US Ign http://us.archive.ubuntu.com trusty/restricted Translation-en_US Ign http://us.archive.ubuntu.com trusty/universe Translation-en_US Fetched 2,003 kB in 33s (59.5 kB/s) Reading package lists... Done W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3C9A6980F827E01E