It goes without saying that you should back up all essential data and files before attempting an upgrade.
As superuser, drop down to runlevel 3 (init 3), i.e. non-GUI multiuser and execute the following commands in the order that they are shown below.
# rpm --import https://fedoraproject.org/static/A82BA4B7.txt # yum -y update yum # yum clean all # yum -y --releasever=16 --disableplugin=presto distro-sync
That is it. Reboot your system to ensure that the upgrade to Fedora 16 was successful.