Comment 6 for bug 1506364

I need to update what I just posted.

Installing with 160MB /boot size works, but sends errors and application crashes just after you do your first system upgrade.

The kernel and some stuff needs about 10-20MB. The initramfs almost 60MB. When there is an old kernel plus a new one installed, this doubles to ~150MB space required. But when the initramfs is being rebuild because of some module update, it is being rebuild in a temporary file on /boot!

It would be better if this one was assembled on /tmp instead and then move to boot.

This requires an additional 60MB of space. So the bare minimum required to function is somewhere around 210MB. Add some filesystem overhead etc. and you need to create at least a 256MB /boot partition. If you do not clean up your older kernels right away, you should even go for 512MB. The installer should warn under 512MB that it requires at least 256MB and recommends 512MB.