I have installed Precise 12.04 armhf to beaglebone hundred of times and did not face a problem. Today I tried to install it for my beagleboard-xm and got these errors:
Ah? So what's the problem? The image boot right?
That message is to just to "inform" you, that I made a slight change
to one of the upstart scripts, so you wouldn't have to wait 2 Minutes
for a login prompt to appear on the serial console when you DON'T have
the Ethernet plugged in.
If for some crazy reason you like that feature, i gave the 3 commands
to undo my fix.. 
Regards,
Oh! you are right. Sorry for the inconvenience. 
No problem.. As an end user do you have any hints to make that
more obvious, without getting too 'wordy' ?
Regards,
I do not know maybe you can add a note like: “no need to panic. this is just to inform advanced users. nothing is wrong with your image” = )