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ywn@ywn-virtual-machine:~/bitcoin/bin$ bitcoind -connect="18.214.92.184"
Error: Cannot obtain a lock on data directory /home/ywn/btc_data. Bitcoin Core is probably already running.
ywn@ywn-virtual-machine:~/bitcoin/bin$
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Identify all the Bitcoin core processes, kill those "gracely" and then follow the steps that other users indicated.