If you change the line:
console "/usr/libexec/getty std.9600" vt220 off
console "/usr/libexec/getty std.9600" vt220 on
in "/etc/ttys" everything should start working with the serial console.
Thanks for an excellent tutorial.
Thank you so much for your great suggestion :)
Actually, I was in trouble because I didn't know how to enable GCP serial console.
I have updated my post "(1/2)".
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