ftp.ntua.gr:/mirror/ubuntu/dists/groovy-proposed/main/signed/linux-gcp-amd64/current/?C=M&O=D 
Icon  Name                                             Last modified      Size  Description
[DIR] Parent Directory                                                      -   
[   ] signed.tar.gz                                    03-May-2021 03:08   22M  
[   ] SHA256SUMS.gpg                                   03-May-2021 03:08  819   
[   ] SHA256SUMS                                       03-May-2021 03:08   80
Apache/2.2 Server at ftp.ntua.gr Port 80