E: Could not get a lock / var / lib / dpkg / lock-frontend. Maintained by process 12657 (synaptic)
N: Please note that removing the lock file is not a solution and may harm your system.
E: Failed to get the dpkg interface lock (/ var / lib / dpkg / lock-frontend). Is there another process using it?

This has nothing to do with Geany, it is a basic function of the system that you can't run two install processes at the same time.

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