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When this happens, dpkg sets a "lock" and flags itself as "broken." It refuses to process any new requests until the previous job is completed or cleaned up.
Sometimes, running sudo dpkg --configure -a isn't enough. You might see the error persist, or you might encounter new errors relating to "dependency problems." When this happens, dpkg sets a "lock" and
This means another process (like an automatic update, Software Center, or another terminal) is using the package system. Use: When this happens