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============ Log ===========

E: Could not get lock /var/lib/dpkg/lock-frontend. It is held by process 3711 (apt-get)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?

Hi.
I'm new to Linux. Any advice appreciated!

That message is usually triggered when an update process is already active when a second update process is initiated, for example starting a manual check when an automated background check is already running.

Usually just waiting is all that is needed.  Let us know if the symptom continues.