Here is log.

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used.
GPG error: http://ppa.launchpad.net trusty Release: The following signatures were invalid: BADSIG D530E028F59EAE4D Launchpad PPA for NoobsLab
W: Failed to fetch ppa.launchpad.net/noobslab/apps/ubuntu/dists/trusty/Release  
W: Failed to fetch us.archive.ubuntu.com/ubuntu/dists/precise-updates/main/source/Sources  Hash Sum mismatch
W: Failed to fetch ppa.launchpad.net/noobslab/apps-dependencies/ubuntu/dists/trusty/main/binary-amd64/Packages  404  Not Found
W: Failed to fetch ppa.launchpad.net/noobslab/apps-dependencies/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found
W: Some index files failed to download. They have been ignored, or old ones used instead.

Browse other questions tagged or ask your own question.