Linux /boot partition problem (upgrading Fedora Linux)

Summary:
/boot partition too small when trying to upgrade Fedora 10 to 11, 11 to 12, 12 to 13, 13 to 14

Main article:
When not choosing a big enough /boot partition when setting up you Linux system you might get problems when wanting to upgrade to the next major Fedora release.
Fedora (same with Ubuntu) will tell you that space on /boot is missing.
Don't try lvm (Logic Volume Managment) it won't help you!

You have the following possibilties
1. Delete old kernel updates
package-cleanup --oldkernels
2. Empty trash
du -sh .Trash-0
3.
tune2fs -m 0/dev/sda1