Can't access to my dashboard

Hi, since I update my server with apt update & apt upgrade I can’t access to my dashboard anymore.

Was on Dedian 8 before update and now I’m on 9. When I want to update Quickbox I have this error message:

git clone https://github.com/QuickBox/QB /etc/QuickBox
Cloning into ‘/etc/QuickBox’…
fatal: unable to access ‘https://github.com/QuickBox/QB/’: gnutls_handshake() failed: Public key signature verification has failed.

I don’t know what to do. Please help me

Considering the Community Edition doesn’t currently support Debian (any variant) then there could be a considerable number of problems that have occurred. However, that error has all the meat you need for a solution.

What does dpkg -l|grep curl show in ssh?

This is what the command respond:

home/b*****# dpkg -l|grep curl
ii curl 7.52.1-5+deb9u9 amd64 command line tool for transferring data with URL syntax
ii libcurl3:amd64 7.52.1-5+deb9u9 amd64 easy-to-use client-side URL transfer library (OpenSSL flavour)
ii libcurl3-gnutls:amd64 7.52.1-5+deb9u9 amd64 easy-to-use client-side URL transfer library (GnuTLS flavour)
ii libcurl3-gnutls:i386 7.52.1-5+deb9u9 i386 easy-to-use client-side URL transfer library (GnuTLS flavour)
ii libcurl4-gnutls-dev:i386 7.52.1-5+deb9u9 i386 development files and documentation for libcurl (GnuTLS flavour)
ii php7.0-curl 7.0.33-1~dotdeb+8.1 amd64 CURL module for PHP

Thanks

Ok, will you additionally do for us apt-cache policy libcurl3-gnutls

It looks like you’re using a possible problematic version of libcurl3-gnutls=7.52.1-5+deb9u9

The apt-cache command above will allow us to see possible versions for downgrading to.

Thanks again to trying to help me.
This is what the command respond:

shinracorp:/home/b****# apt-cache policy libcurl3-gnutls
libcurl3-gnutls:
Installed: 7.52.1-5+deb9u9
Candidate: 7.52.1-5+deb9u9
Version table:
*** 7.52.1-5+deb9u9 0
500 http://deb.debian.org/debian/ stable/main amd64 Packages
500 http://deb.debian.org/debian-security/ stable/updates/main amd64 Packages
100 /var/lib/dpkg/status
N: Ignoring file ‘50unattended-upgrades.ucf-dist’ in directory ‘/etc/apt/apt.conf.d/’ as it has an invalid filename extension

Anybody’s here? I still need help. Please

Seriously nobody gonna to help me? JMSolo were are you?