Forget an unused wireless connection (Linux Mint)

Trick source

Sometimes unused wireless networks still appear in the network connection applet, or as it happened to me, a misconfigured connection doesn't allow itself to be reset. The trick to make the system to forget it is simple:

$ sudo ls -l /etc/NetworkManager/system-connections/

This will list the current network connections 'remembered' by the system. In order to 'forget' a connection, just delete the file representing the offending connection:

$ sudo rm /etc/NetworkManager/system-connections/NETWORK_NAME_TO_FORGET