gpg key generate 할 때 "X11 proxy: Unsupported authorisation protocol"

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You need a Passphrase to protect your secret key.

can't connect to `/root/.gnupg/S.gpg-agent': No such file or directory
MobaXterm X11 proxy: Unsupported authorisation protocol
xprop:  unable to open display 'localhost:10.0'
MobaXterm X11 proxy: Unsupported authorisation protocol

(pinentry-gtk-2:9048): Gtk-WARNING **: cannot open display: localhost:10.0
gpg-agent[9047]: can't connect server: ec=4.16383
gpg-agent[9047]: can't connect to the PIN entry module: End of file
gpg-agent[9047]: command get_passphrase failed: No pinentry
gpg: problem with the agent: No pinentry
gpg: Key generation canceled.