chown root:root /home/user/
chmod 755 /home/user/

SubSystem sftp internal-sftp
Match Group sftp
ChrootDirectory %h
ForceCommand internal-sftp
AllowTcpForwarding no

#UsePAM yes

sudo groupadd ssh-users
sudo gpasswd -a youruser ssh-users

AllowGroups ssh-users sftp

sudo chown root:sftp-user /home/sftp-user
sudo chmod 750 /home/sftp-user

sudo mkdir /home/sftp-user/public
sudo chown sftp-user: /home/sftp-user/public
sudo chmod 750 /home/sftp-user/public

Subsystem sftp internal-sftp -f AUTH -l VERBOSE
UsePAM yes
Match group sftp
  ChrootDirectory %h
  ForceCommand internal-sftp
  AllowTcpForwarding no

sudo nano /etc/ssh/sshd

PasswordAuthentication yes

Match Group sftpusers
ChrootDirectory %h
ForceCommand internal-sftp
AllowTcpForwarding no

sudo useradd bob
sudo passwd bob

sudo groupadd sftpusers
sudo usermod  -g sftpusers bob
sudo usermod -s /usr/bin/rssh bob
sudo usermod -d /home/bob bob

sudo chown root:root /home/bob/
sudo chmod 755 /home/bob/
sudo mkdir /home/bob/uploads
sudo chown bob /home/bob/uploads

sudo service sshd restart