This isn't a bug rather it is an informative message from update-manager
telling you that another package manager is currently running.
** Package changed: ubuntu => update-manager (Ubuntu)
** Changed in: update-manager (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/741258
Title:
Unable to get exclusive lock This usually means that another package
management application (like apt-get or aptitude) is already running.
Please close that application first.
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