I have LMDE 64 bits and have been downloading calibre for ages without any problem. Today:
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roger@lmde64:~$ sudo -v && wget -nv -O- https://github.com/kovidgoyal/calibre/raw/master/setup/linux-installer.py | sudo python -c "import sys; main=lambda:sys.stderr.write('Download failed\n'); exec(sys.stdin.read()); main()"
[sudo] password for roger:
GnuTLS: A TLS warning alert has been received.
Incapable d'établir une connexion SSL.
Download failed