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I tried to install cowsay using the command:

sudo apt-get install cowsay

I received the following error message:

E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
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    Are your computer doing updates? Your computer locks the folders while doing updates.
    – Mr.Turtle
    Apr 14, 2016 at 10:36

2 Answers 2

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If another apt-get instance is running in another terminal, you should close it or let it complete the task before running apt-get in another terminal. If that's not the case, remove the lock file in /var/lib/dpkg/ directory with

sudo rm /var/lib/dpkg/lock
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It probably means another apt-get process crashed before completion. Just log out and log in again.

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