ftp.ntua.gr:/ubuntu/dists/bionic-security/main/signed/linux-gkeop-5.4-amd64/?C=S&O=D 
Icon  Name                                             Last modified      Size  Description
[DIR] Parent Directory                                                      -   
[DIR] current/                                         12-May-2021 12:53    -   
[DIR] 5.4.0-1015.16~18.04.1/                           12-May-2021 12:53    -   
[DIR] 5.4.0-1014.15~18.04.1/                           16-Apr-2021 00:20    -   
[DIR] 5.4.0-1013.14~18.04.1/                           15-Apr-2021 22:01    -
Apache/2.2 Server at ftp.ntua.gr Port 80