ftp.ntua.gr:/ubuntu/dists/bionic-security/main/signed/linux-gcp-amd64/current/?C=M&O=D 
Icon  Name                                             Last modified      Size  Description
[DIR] Parent Directory                                                      -   
[   ] SHA256SUMS.gpg                                   08-Apr-2020 11:08  819   
[   ] signed.tar.gz                                    08-Apr-2020 11:08   16M  
[   ] SHA256SUMS                                       08-Apr-2020 11:08   80
Apache/2.2 Server at ftp.ntua.gr Port 80