I am using Ubuntu 16.04 LTS. I was updating the software on my PC through the Software Updater. It downloaded all the packages but unfortunately during the installation process it stopped responding from the last 3 hours. Please suggest the safest possible way to get out of this situation.
I had exactly the same problem. I killed the process software updater using the System Moniter. Then i restarted the machine and tried to update it again using the terminal. It said that i had to run some command to configure the error.(I don't remember the command) Then the software updater displayed a message saying updates have been already downloaded click to insall. I did so. Then the software updater installed the updates. Problem solved.
note: Some of the steps I described may not be essential. I just described what I did.