Upgraded to 1.7 -> OK.

But still an error message:
wget -O - https://wapt.tranquil.it/debian/tiswapt-pub.gpg | apt-key add -
--2019-09-11 13:18:41-- https://wapt.tranquil.it/debian/tiswapt-pub.gpg
Resolving wapt.tranquil.it (wapt.tranquil.it)... 185.16.48.72
Connecting to wapt ...

Using this command, I no longer get the error message:
`curl -k https://wapt.tranquil.it/debian/wapt-1.7/dists/stretch/InRelease | gpg --keyring /etc/apt/trusted.gpg --verify`.

The result of this command without the `-k` is:
`curl https://wapt.tranquil.it/debian/wapt-1.7/dists/stretch/InRelease ...`

Hello,
I'm having trouble updating the WAPT 1.5 community server installed on Debian 9 to version 1.7.
I'm getting an error message regarding the GPG key
: GPG error: https://wapt.tranquil.it/debian/wapt-1.7 stretch InRelease: The following signatures were ...