ftp.ntua.gr:/ubuntu/dists/bionic-security/main/signed/linux-gke-5.4-amd64/current/?C=M&O=A 
Icon  Name                                             Last modified      Size  Description
[DIR] Parent Directory                                                      -   
[   ] SHA256SUMS                                       12-May-2021 12:53   80   
[   ] SHA256SUMS.gpg                                   12-May-2021 12:53  819   
[   ] signed.tar.gz                                    12-May-2021 12:53   17M
Apache/2.2 Server at ftp.ntua.gr Port 80