Comment 6 for bug 34708

I have what may be a similar problem. I just tried the grub solution proposed above and had maybe a micro-second of success, but not real solution.

In upgrading to dapper LTS 2.6.15-23 from breezy 2.6.12-10 using the synaptics prompt, I lost all eth and had splash screen problems. Booting again using 2.6.12-10 solves them. I have tried this several times and it is true each time.

The networking problem seems to be that the card is completely not recognised: I can't get it started from ifdown eth0; ifup eth0, or from sudo /etc/init.d/networking restart. I also get a whole series of errors having to do with postfix (in 2.6.15-23 only). The splash screen problem is that the Ubuntu splash (the one before the login) is pushed over against the right side of the monitor.

Anyway, this seems to me to be a pretty critical error, as it wipes out network access from machines that worked fine under breezy.