Ubuntu upgrading problems

I upgraded my Ubuntu 9.04 (Jaunty Jackalope) to 9.10 (Karmic Koala) as soon as it released. I tried the online upgrade.  But after upgrade I lost my internet connection settings and I couldn’t  connect the internet. And there was no sound also.

Ubuntu starup screen

How I solved these issues?

For connecting internet I tried
sudo pppoeconf command on terminal instead of the networking menu. And it work, I was able to detect my network card and set a username and password for my connection.

For solving the sound issue, I upgraded my Grub with this command
sudo aptitude install GRUB2
sudo update-grub

The details of Grub 2 can be found here (The Grub 2 guide)

I tried alternative commands / fixes to get it work. But these are the solutions worked for me. What do you think? Have you faced problems with Ubuntu upgrade? Post your comments here and share with others.