Sometimes when you’re trying to either use the Update manager or sudo apt-get update in Ubuntu, it will throw an error saying it was ‘Unable to lock download directory’. More than likely another instance of apt-get is running in the background. Luckily this issue is easily fixed by typing this into a terminal:
sudo pkill apt
This will look for apt to see if any instances are running and kill them. Now you should be able to update as you would normally.
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