ftp.ntua.gr:/ubuntu/dists/xenial/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64/?C=N&O=D 
Icon  Name                                             Last modified      Size  Description
[DIR] Parent Directory                                                      -   
[DIR] pxelinux.cfg/                                    20-Apr-2016 18:53    -   
[   ] pxelinux.0                                       20-Apr-2016 18:53   42K  
[   ] linux                                            20-Apr-2016 18:53  6.7M  
[   ] initrd.gz                                        20-Apr-2016 18:53   36M  
[DIR] boot-screens/                                    20-Apr-2016 18:53    -
Apache/2.2 Server at ftp.ntua.gr Port 80