[trinity-users] apt-cacher ng pukes with trinity-sb and trinity-testing repos

I need apt-cacher-ng as i build system images (Exe GNU/Linux, Devuan+TDE) but have limited internet access. All repos, including http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-r14.0.x work normally with apt-cacher-ng except when trinity-sb and/or trinity-testing are enabled. They are configured exactly as per Trinity site instructions and the keyring is installed. Without using apt-cacher-ng (proxy disabled in /etc/apt/apt.conf.d/) trinity-sb and/or trinity-testing work. They do work using a (much) older apt-cacher-ng version (0.8.0-3) Is something wrong with the "InRelease" file? Thanks in advance.. Dave Hare ############################ root@beowulf:# apt update Hit:1 http://download.opensuse.org/repositories/home:/stevenpusser/Debian_10 InRelease Hit:2 http://pkgmaster.devuan.org/merged beowulf InRelease Get:3 http://exegnulinux.net/apt ascii InRelease [2,840 B] Hit:4 http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-r14.0.x buster InRelease Hit:5 http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-builddeps-r14.0.x buster InRelease Err:6 http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-sb buster InRelease 500 Apt-Cacher NG does not like that data [IP: ::1 3142] Reading package lists... Done E: Failed to fetch http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-sb/dists/buster/In… 500 Apt-Cacher NG does not like that data [IP: ::1 3142] E: The repository 'http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-sb buster InRelease' is no longer signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. ############################