I have Ubuntu 20.04.4 LTS installed in my machine. I am behind a proxy server(in college) and I am facing a problem after I have started using proxy. The problem is : The Network manager gets stopped automatically. I have attached screenshots as well.

This problem has already happened with others before and people have suggested to restart NetworkManager.service, but I can't do so as I can't run any 'sudo' command once this problem is started(ssht attached). I even tried to restart using "/etc/init.d/network-manager restart", but this doesn't work as well. I have already reinstalled Ubuntu(even deleted all partition as well), this doesn't worked as well.

The only option left is restarting my machine which doesn't get shut down in the regular way, so I have to shut it down using power button.

[![Image1](https://i.stack.imgur.com/TMF7Y.png)](https://i.stack.imgur.com/TMF7Y.png)

[![Image2](https://i.stack.imgur.com/Md9ts.png)](https://i.stack.imgur.com/Md9ts.png)

Looking forward for some help.

I have uploaded logs of kernel and Network manager in the drive. Attached is the link to it.

[Logs](https://drive.google.com/drive/folders/1MCwYJf11WvJAtlXnWOi_P2cQs8M-T6Mv?usp=sharing)