how to setup sftp server ubuntu

sudo groupadd ftpaccess
sudo nano /etc/ssh/sshd_config


Add these lines to the bottom:

Match Group ftpaccess
ChrootDirectory /data/%u
ForceCommand internal-sftp

sudo service ssh restart
sudo userdel -r giffgaff
sudo useradd -m giffgaff -g ftpaccess -s /usr/sbin/nologin
sudo passwd giffgaff
sudo chown root /home/giffgaff
sudo mkdir /home/giffgaff/leads
sudo chown giffgaff:ftpaccess /home/giffgaff/leads