Did you add any PCI based cards to your computer recently? 'cos that's what happened in my case.After I inserted a PCI based ethernet card in my computer when my on-board one stopped working, I get this message everytime I boot my computer. I guess BIOS is assigning an interrupt for the card or something...

Michael Havens wrote:

Nowadays when I start this old computer up when it runs through the very first 
screen something new appears (at least a newly noticed thing). It says"... 
hooking bootstrap interupt 18h". I know that I just upgraded debbootstrap (or 
something like that) and was wondering if the two were relaated. 

I was also wondering how debootstrap is different from apt-get. (aside from 
being a bit more complex) Then there is 'debi' which seems to be another 
complex apt-get...