While upgrading from Ubuntu 14.04 LTS to 16.04 LTS, every process got done like Getting new packages, Installing upgrades, the last process was Cleaning. Now, my PC is running fine on 16.04 but while turning it on and shutting it down, it is showing to clean and giving errors. Due to electricity problem, cleaning process while upgrading didn't went well.


I think the last cleaning process runs something like this:

sudo apt-get clean

which removes any downloaded packages already installed, and this command:

sudo apt-get autoremove

will remove any packages no longer in use like old kernels and the like.

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