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Full Version: Update error - Failed to get lock on file
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E: Failed to get lock on file /var/lib/apt/lists/lock. It is being held by process 1691 (apt-get)
E: Unable to lock directory /var/lib/apt/lists/

How fix it?
That's a slightly unusual message.
Can you tell us the sequence of events leading to this ?
Have you tried re-running the install updates ?