ftp.ntua.gr:/ubuntu/dists/focal-updates/main/uefi/grub2-amd64/current/?C=S&O=D 
Icon  Name                                             Last modified      Size  Description
[DIR] Parent Directory                                                      -   
[   ] grubx64.efi.signed                               27-Apr-2021 12:08  1.6M  
[   ] grubx64.efi                                      27-Apr-2021 12:08  1.6M  
[   ] grubnetx64.efi.signed                            27-Apr-2021 12:08  1.4M  
[   ] grubnetx64.efi                                   27-Apr-2021 12:08  1.4M  
[   ] gcdx64.efi.signed                                27-Apr-2021 12:08  1.4M  
[   ] gcdx64.efi                                       27-Apr-2021 12:08  1.4M  
[   ] SHA256SUMS.gpg                                   27-Apr-2021 12:08  1.5K  
[   ] SHA256SUMS                                       27-Apr-2021 12:08  650   
[   ] version                                          27-Apr-2021 12:08   15   
[DIR] control/                                         27-Apr-2021 12:08    -
Apache/2.2 Server at ftp.ntua.gr Port 80