ftp.ntua.gr:/ubuntu/dists/bionic/main/signed/linux-amd64/4.15.0-20.21/?C=S&O=D 
Icon  Name                                             Last modified      Size  Description
[DIR] Parent Directory                                                      -   
[   ] signed.tar.gz                                    25-Apr-2018 02:08   30M  
[   ] SHA256SUMS.gpg                                   25-Apr-2018 02:08  819   
[   ] SHA256SUMS                                       25-Apr-2018 02:08   80
Apache/2.2 Server at ftp.ntua.gr Port 80