ftp.ntua.gr:/mirror/ubuntu/dists/bionic-security/main/signed/linux-gke-5.3-amd64/current/?C=M&O=D 
Icon  Name                                             Last modified      Size  Description
[DIR] Parent Directory                                                      -   
[   ] signed.tar.gz                                    20-Apr-2021 13:18   17M  
[   ] SHA256SUMS.gpg                                   20-Apr-2021 13:18  819   
[   ] SHA256SUMS                                       20-Apr-2021 13:18   80
Apache/2.2 Server at ftp.grnet.gr Port 80