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.

Today I successfully configured OpenDNS on my PC and I think it would be useful for others. OpenDNS already published how to set up an OpenDNS on your Linux based computer. I customized that instructions for BSNL Broadband connection.

Before starting What is OpenDNS?

OpenDNS is a better DNS, free to all. OpenDNS uses its distributed network of DNS servers to speed up your Internet experience, increase reliability, improve security and make DNS smarter for users all over the world.

Steps

1. Right-click on ‘Network Icon’ (located at top-right panel by default) and click on ‘Edit Connections’ to open Network Connections Manager.
2. Choose the type of connection you have. For this example, I will use ‘DSL’.
3. Under ‘DSL’, highlight ‘BSNL BB’ (my bsnl connection) and click on ‘Edit’.

4. Inside ‘Editing BSNL BB’ window, click on ‘IPv4 Settings’ tab.
5. Under ‘IPv4 Settings’, change the ‘Method’ to Automatic (PPPoE) addresses only.
6. Put these nameserver addresses as your ‘DNS Servers’: 208.67.222.222, 208.67.220.220

7. Click ‘Apply’ and reboot your machine. You can then visit http://welcome.opendns.com to confirm you are using OpenDNS.