I faced a problem with the space available on the disk and for dev loop0 it gave me 0 available space, so I deleted any old unused kernel as I googled that. My current used kernel was 4.4.0-36 so I deleted the only other version of kernel which was 4.4.0-31 as I searched.

I also used the following commands to solve that problem :

sudo apt-get update 
sudo apt-get upgrade 
sudo apt-get clean 

Although that the password is correct, I became stuck in the login screen when I rebooted my Ubuntu 16 later on. The screen was moved to a black screen with the following line for a moment and back again to the login screen:

blk_update_request: I/O error , dev loop0 , sector 22675464

I tried all the possible solutions available on the Internet, but unfortunately, when got the Terminal and typed sudo it gave that it does found in the /user/bin.

So I could not be able to solve this problem and I do not want to install Ubuntu again because I have an important work and files.

Could you give a full answer for this problem - and for the other problem which is the space problem - in a correct way?

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