installing PPA for Mactel Support from https://launchpad.net/~mactel-support/+archive/ppa solved this issue for me on a Macbook Pro 4.1 with 10.5.8
installing PPA for Mactel Support from https:/ /launchpad. net/~mactel- support/ +archive/ ppa
solved this issue for me on a Macbook Pro 4.1 with 10.5.8