HELP - boot problem after oneiric upgrade

Situation: MacBookPro 6.2 triple boot (rEFIt): snow leopard + W7 + Ubuntu 11.10 (updated from 10.04) everything working fine.

Problem: automatic update of ubuntu 11.10 > reload > grey screen with question mark: no boot at all!! :(

tentative solutions:
start + opt -> no result :(
start + D -> no result :(
start + opt + cmd + P + R -> no result :(
ubuntu 11.04 live CD + start + C -> OK everything working fine :) but cannot mount the HDD :(
original system disk (mac OSX 10.6.3) + start + C -> I can see apple logo and the wheel, but after some minutes everything is frozen :(

I suppose that something went wrong with rEFIt during the ubuntu 11.10 update, but I do not know how to operate.

Is there someone that can help me????

Thanks a lot for any suggestion

Please, can anyone help me??

Hey, I am new here and not very good with Ubuntu, but I did read somewhere that you can make an ISO dvd and boot from that to reinstall. That may not be the option you are looking for if file recovery is an issue.

I just went through an upgrade boot meltdown detailed here: http://ubuntuforums.org/showthread.php?t=1868640

Even though I'm not a superuser, I was able to retrieve my encrypted data using the method here:
http://bodhizazen.net/Tutorials/Ecryptfs#Live

Thanks to all
Somehow the oneiric update made something to the boot partition.
I'll have to reboot from osx DVD, but my original ststem DVD is corrupted.
I'm trying to have a new one.....

You may want to read this.


http://ubuntuforums.org/showthread.php?t=1868640