install proftpd on ubuntu

ubuntu_proftpd.sh

#!/bin/bash

# Proftpd
#apt-get --force-yes -y update
#apt-get --force-yes -y upgrade

rm -rf /etc/proftpd
apt-get --force-yes -y install proftpd

echo "
DefaultRoot ~

AuthOrder   mod_auth_file.c 
AuthPAM on 
AuthUserFile    /etc/proftpd/ftpd.passwd 
AuthGroupFile   /etc/proftpd/ftpd.group 
RequireValidShell    off 
PersistentPasswd     off 
AllowRetrieveRestart on 
AllowStoreRestart on 
" > /etc/proftpd/conf.d/auth.conf

# Proftpd virtual auth, use account www-data
ftpasswd --passwd --name www-data --file /etc/proftpd/ftpd.passwd --uid `cat /etc/passwd | grep www-data | cut -d: -f3` --gid `cat /etc/passwd | grep www-data | cut -d: -f4` --home /var/www/ --shell /usr/sbin/nologin
ftpasswd --group --name www-data --file /etc/proftpd/ftpd.group --gid `cat /etc/passwd | grep www-data | cut -d: -f4` --member www-data

chmod 660 /etc/proftpd/ftpd.passwd /etc/proftpd/ftpd.group
chown proftpd /etc/proftpd/ftpd.passwd /etc/proftpd/ftpd.group
service proftpd stop
service proftpd start