How to Enable Password Authentication in GCP or on any Virtual Machine?

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Edit the file 60-cloudimg-settings.conf

Existing file looks like.

/etc/ssh/sshd_config.d/60-cloudimg-settings.conf

# CLOUD_IMG: This file was created/modified by the Cloud Image build process

# Google Compute Engine times out connections after 10 minutes of inactivity.
# Keep alive ssh connections by sending a packet every 2 minutes.
ClientAliveInterval 120

# Prevent reverse DNS lookups.
UseDNS no
root@prod-ffmpeg-service:/etc/ssh/sshd_config.d# cat 60-cloudimg-settings.conf
PasswordAuthentication no

Changes required

PasswordAuthentication yes

Restart the sshd service.

sudo systemctl restart sshd