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The text Do you want to start the upgrade? appears, but there is no place to press YES.

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open terminal (CTRL+Alt+T) and run:

sudo apt-get update && sudo apt-get upgrade

if you got this error

"Could not get lock /var/lib/apt/lists/lock"

  1. Open the terminal and run one of these commands:

    sudo rm /var/lib/apt/lists/lock


sudo rm -f /var/lib/apt/lists/lock


sudo killall -9 apt-get aptitude

Then make an update with this command:

sudo apt-get update
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