mirror.xcer.cz download site....heads up...

This is just a heads up, you probably already know... "When I ran apt-get update" at 6 pm today, apt found the site, read through the package list, then gave a GPG error of no Public Key: NO_PUBKEY 608F529A304BE668 It said there was no public key available for mirror.xcer.cz and would not download Trinity. I had already uploaded your key, using apt-key and verified that it was installed and working. I was downloading the Trinity 14.4 version for use with Debian stretch version 9.1 Yesterday, on my first attempt to install Trinity on stretch, the Trinity package from that mirror, downloaded with no problems. Debian was a problem though and had to be reinstalled, which is why I am doing the complete install again today. I will keep trying until it comes back up, I have no computer currently, so I can only check my emails when I go to a friends house and use his. Keith