To install FTP server:

sudo apt-get install vsftpd
sudo nano /etc/vsftpd.conf
anonymous_enable=YES Change To anonymous_enable=NO
#local_enable=YES Change To local_enable=YES
#write_enable=YES Change To write_enable=YES
force_dot_files=YES
sudo service vsftpd restart

To allow root access: (don't!):

sudo nano /etc/ftpusers
root Change to #root
sudo nano /etc/vsftpd.conf
userlist_deny=YES