Unable to update Calibre (Ubuntu) since 2.76

Hi

I have been unable to update Calibre on my Ubuntu 16.04 server since v 2.76. I have used the following command to download &install:

sudo -v && wget --no-check-certificate -nv -O- https://download.calibre-ebook.com/linux-installer.py | sudo python -c "import sys; main=lambda:sys.stderr.write('Download failed\n'); exec(sys.stdin.read()); main()"


but get this error...

Traceback (most recent call last):
File "<string>", line 1, in <module>
File "<string>", line 673, in main
File "<string>", line 658, in run_installer
File "<string>", line 631, in download_and_extract
File "<string>", line 333, in download_tarball
File "<string>", line 292, in do_download
File "/usr/lib/python2.7/socket.py", line 384, in read
data = self._sock.recv(left)
File "/usr/lib/python2.7/ssl.py", line 756, in recv
return self.read(buflen)
File "/usr/lib/python2.7/ssl.py", line 643, in read
v = self._sslobj.read(len)
ssl.SSLError: [SSL: DECRYPTION_FAILED_OR_BAD_RECORD_MAC] decryption failed or bad record mac (_ssl.c:1754)

Can anyone please advise how I can possibly work-around this issue.

Many thanks