SFTP server with VSFTPD

$ sudo apt install ssh

$ sudo nano /etc/ssh/sshd_config

and append the following to the end of the file:

Match group sftp ChrootDirectory /home X11Forwarding no AllowTcpForwarding no ForceCommand internal-sftp

$ sudo service ssh restart

$ sudo addgroup sftp Adding group `sftp' (GID 1001) ... Done.

$ sudo useradd -m sftpuser -g sftp

$ sudo passwd sftpuser Enter new UNIX password: Retype new UNIX password: passwd: password updated successfully

$ sudo chmod 700 /home/sftpuser/

https://linuxconfig.org/how-to-setup-sftp-server-on-ubuntu-18-04-bionic-beaver-with-vsftpd