ftp.ntua.gr:/mirror/ubuntu/dists/bionic-security/main/uefi/grub2-amd64/current/?C=N&O=D 
Icon  Name                                             Last modified      Size  Description
[DIR] Parent Directory                                                      -   
[   ] version                                          04-Aug-2020 21:03   17   
[   ] gsbx64.efi.signed                                04-Aug-2020 21:03  1.0M  
[   ] gsbx64.efi                                       04-Aug-2020 21:03  1.0M  
[   ] grubx64.efi.signed                               04-Aug-2020 21:03  1.1M  
[   ] grubx64.efi                                      04-Aug-2020 21:03  1.1M  
[   ] grubnetx64.efi.signed                            04-Aug-2020 21:03  1.1M  
[   ] grubnetx64.efi                                   04-Aug-2020 21:03  1.1M  
[   ] gcdx64.efi.signed                                04-Aug-2020 21:03  1.1M  
[   ] gcdx64.efi                                       04-Aug-2020 21:03  1.1M  
[DIR] control/                                         04-Aug-2020 21:03    -   
[   ] SHA256SUMS.gpg                                   04-Aug-2020 21:03  819   
[   ] SHA256SUMS                                       04-Aug-2020 21:03  811
Apache/2.2 Server at ftp.ntua.gr Port 80