Error: dpkg frontend is locked by another process

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I am trying to install a software using dpkg but I am getting this error. 

Error: dpkg frontend is locked by another process

Can someone tell me how to solve this?

Apr 1 in Linux Administration by Gagan
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First run:

lsof /var/lib/dpkg/lock

Then make sure that process isn't running:

ps cax | grep PID

If it is running:

kill PID

#wait

kill -9 PID

Now you will be able to use dpkg.

answered Apr 1 by Shir

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