ProFTPd is one the easiest ftp server to install and configure. Use following command to install ProFTPd server.
sudo apt-get -y install proftpd
Now open /etc/proftpd.conf file and change root to something like below.
Above configuration option tells ProFTPd to use ftp folder in your home for storage purpose. So don't forget to create the folder. Now restart ProFTPd using following command.
sudo /etc/init.d/proftpd restart
Now your Ubuntu FTP server is ready.
vsftpd is another ftp server which is available right out of Ubuntu repositories. Install vsftpd using following command.
sudo apt-get -y install vsftpd
vsftpd has numerous number of configuration options available and you can use these options to control every aspect of your ftp server. You can modify /etc/vsftpd.conf to change behavior of your ftp server.