ftp.ntua.gr:/ubuntu/dists/bionic-security/main/signed/linux-gcp-4.15-amd64/?C=S&O=D 
Icon  Name                                             Last modified      Size  Description
[DIR] Parent Directory                                                      -   
[DIR] current/                                         12-May-2021 12:54    -   
[DIR] 4.15.0-1099.112/                                 12-May-2021 12:54    -   
[DIR] 4.15.0-1098.111/                                 17-Apr-2021 09:33    -   
[DIR] 4.15.0-1097.110/                                 15-Apr-2021 22:01    -
Apache/2.2 Server at ftp.ntua.gr Port 80