Upgrade Fedora 15 to 16

I found 'preupgrade' is the best tool to upgrade you system. You can download fedora image from it's site and or you can use upgrade commands or you can use preupgrade tool to update your fedora15 to fedora16.

First update your system:

$ su             //enter super user password

$ yum update

Verify the upgrade:

$ yum repolist

$ yum distro-sync

Then install preupgrade:

$ yum install preupgrade

Start preupgrade:

$ preupgrade

The best part of preupgrade is you can stop your download any time and it resume downloading on start next time.

After complete all five steps the computer will restart and upgrade old system but it will take some time. So, Enjoy Fedora16 . . . 

Try overview of fedora 16