First of all yesterday a list of updates arrived of total size of 200.3MB. I updated it and after that i restarted my system but network manager is showing that there is no network connection (Wifi not connecting but for the time being surviving with USB ethernet). I have tried chrooting but that did not help. I was looking for similar problem which I am facing but I couldn't find. And also kindly suggest the most reliable mirrors which releases stable updates. Currently I am using Germany now. Maybe Some faulty updates were released and it came into my system and corrupted network manager. Kindly help before my laptop's battery is used by phone!!