ftp.ntua.gr:/ubuntu/dists/bionic/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64/?C=D&O=D 
Icon  Name                                             Last modified      Size  Description
[DIR] Parent Directory                                                      -   
[DIR] pxelinux.cfg/                                    26-Apr-2018 00:23    -   
[   ] pxelinux.0                                       26-Apr-2018 00:23   41K  
[   ] linux                                            26-Apr-2018 00:23  7.9M  
[   ] initrd.gz                                        26-Apr-2018 00:23   45M  
[DIR] boot-screens/                                    26-Apr-2018 00:23    -
Apache/2.2 Server at ftp.ntua.gr Port 80