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Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)
E: Unable to lock directory /var/lib/apt/lists/
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?
George Udosen
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The following phrase in your posted question is another process using it? is probably a good hint at the actual problem.

Your described problem is most likely caused by another apt-get or dpkg instance, which can for example happen if you're upgrading packages in one terminal and at the same time execute apt-get update in another.

@Feldspar15523 basically answered this one already.

Christian Heinrichs
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