Q: How to configure FTP Server to allow anonymous FTP user to read only?

1. Read General Notes
2. Read How to install FTP Server for File Transfer service?

3. sudo cp /etc/proftpd.conf /etc/proftpd.conf_backup
   sudo gedit /etc/proftpd.conf

4. Append the following lines at the end of file

   <Anonymous ~ftp>
     User                        ftp
     Group                       nogroup
     UserAlias                   anonymous ftp
     DirFakeUser on ftp
     DirFakeGroup on ftp
     RequireValidShell           off
     MaxClients                  10
     DisplayLogin                welcome.msg
     DisplayFirstChdir           .message
     <Directory *>
       <Limit WRITE>
         DenyAll
       </Limit>
     </Directory>
   </Anonymous>

5. Save the edited file (sample)

6. sudo /etc/init.d/proftpd restart