I am currently facing an issue with my network connection. I have a wired connection to my Ubuntu home desktop. It was working fine until after recent upgrade. Now I see a question mark on my network icon in the system tray on the upper notification bar. Browsers, updates, and other application don't have any connectivity. However, when I connect to my lab's gateway (IP) using the NetExtender, it connect successfully. Then using an RDP client using the IP of my lab's computer, I can successfully connect. My /etc/resolv.conf has only three lines as follows:
# Generated by NetworkManager
I have tried changing the line "search lan" to my local gateway/router IP without success. I can also ping IP addresses (for example, Google DNS 188.8.131.52, my own router's IP etc.) from the terminal but can't ping names (e.g., www.google.com; "temporary failure in name resolution"). I have disabled the firewall too just to ensure no conflict without success. Any help to resolve this issue is highly appreciable. I did not uninstall NetExtender to check whether that solves the issue since this is the only way I can connect.