How to fix “Unable to lock the administration directory (/var/lib/dpkg/) is another process using it?” ?!


delete the lock file with the following command:
sudo rm /var/lib/apt/lists/lock
You may also need to delete the lock file in the cache directory
sudo rm /var/cache/apt/archives/lock
sudo rm /var/lib/dpkg/lock
After that, try opening Synaptic again.

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