Internet connection no longer working after apt-get update && apt-get upgrade

OS: Ubuntu Mate 16.04 LTS
Platform: Raspberry Pi 2 Model B
Internet Connection: Wifi

Steps to reproduce:

After fresh OS installation, I updated the pi using apt-get update and apt-get upgrade. Pi successfully get all the updates from its respective repo and installed afterwards.

After the installation of updates, I rebooted the pi.

When started from reboot, internet connection no longer working.

Internet connection on other workstation working well.

Tried to ping the router and it gets responses.

Please advise. Thanks!