Description of problem:
The installation guide recommends 100 MB which is certainly not enough with the development of preupgrade which uses /boot the initial bootstrap data.
Also refer to
The bug that this links to bz # 510970 states that 250MB is enough
- the current F12 draft of the guide has this listed which is consistent with Rudi's comments here:
I am going to close this bug, if you feel that I have missed something either in another bug or in the one referenced by the common bug page, please reopen.