Broken installation

Help! Following what I thought was a routine upgrade of my Debian Jessie/Sid system, Trinity has broken. Completely. Many programs have disappeared from /opt/trinity/bin (most particularly kmail - I'm writing this on an old backup system). In an attempt to recover this, I have (I believe) downgraded the system to Wheezy with the following /etc/apt/sources.list ------ deb http://ftp.nz.debian.org/debian/ wheezy main non-free contrib deb-src http://ftp.nz.debian.org/debian/ wheezy main non-free contrib deb http://security.debian.org/ wheezy/updates main contrib non-free deb-src http://security.debian.org/ wheezy/updates main contrib non-free ### I tried both this set and the ones below deb http://ppa.quickbuild.pearsoncomputing.net/slavek-banko/axis/ubuntu wheezy main deb-src http://ppa.quickbuild.pearsoncomputing.net/slavek-banko/axis/ubuntu wheezy main ##deb http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-v3.5.13/debian wheezy main ##deb-src http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-v3.5.13/debian wheezy main ##deb http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-builddeps-v3.5.1… wheezy main ##deb-src http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-builddeps-v3.5.1… wheezy main ------- After that, apt-get install desktop-base-trinity appears to work. But apt-get install kde-trinity gives: ----- The following packages have unmet dependencies: kde-trinity : Depends: kde-core-trinity (>= 5:47) but it is not going to be installed Depends: kdeaddons-trinity (>= 4:3.5.5) but it is not going to be installed Depends: kdegraphics-trinity (>= 4:3.5.5) but it is not going to be installed Depends: kdepim-trinity (>= 4:3.5.5) but it is not going to be installed Depends: kdeutils-trinity (>= 4:3.5.5) but it is not going to be installed E: Unable to correct problems, you have held broken packages. ----- Several questions: What have I done wrong?! All suggestions welcome... I tried to follow the instructions at http://www.trinitydesktop.org/wiki/bin/view/Documentation/DebianBinaryInsta… Are they actually correct? Has anyone else succeeded in a new or upgraded installation in the last couple of days? cheers anthony -- Sent from my linux system running Debian 8, desktop trinity-KDE. This email is plain text, not HTML. Any attachments are either .jpeg or .pdf