First run:

lsof /var/lib/dpkg/lock

Then make sure that process isn't running:

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ps cax | grep PID

If it is running:

kill PID
#wait
kill -9 PID

Make sure process is done:

ps cax | grep PID

Then remove the lock file:

sudo rm /var/lib/dpkg/lock

Let dpkg fix itself:

sudo dpkg --configure -a

You should be fine afterwards :)

 
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