Hello,

for specific and motivated reasons, my Debian installation is composed 
of packages spread across the following repositories listed in my 
sources.list:

> deb http://ftp.de.debian.org/debian jessie main
> deb http://ftp.de.debian.org/debian wheezy main
>
> # kde3 for ubuntu/squeeze  (being replaced by Trinity, right now)
> #deb http://ppa.launchpad.net/kde3-maintainers/ppa/ubuntu/ karmic main
>
> # trinity
> deb http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-r14.0.0/debian jessie main
> deb http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-builddeps-r14.0.0/debian jessie main
>
> ## displaylink xorg driver
> deb http://ch.archive.ubuntu.com/ubuntu/ precise main universe

After I issue
     # apt-get update
     # apt-get install tde-trinity

I get:
     The following packages have unmet dependencies:
      tde-trinity : Depends: tdeaddons-trinity (>= 4:14.0.0~) but it is 
not going to be installed
                    Depends: tdepim-trinity (>= 4:14.0.0~) but it is not 
going to be installed
     E: Unable to correct problems, you have held broken packages.


Going down the dependency chain, I find:
     # apt-get install tde-trinity tdeaddons-trinity 
kaddressbook-plugins-trinity kaddressbook-trinity libical1
     Package libical1 is not available, but is referred to by another 
package. [...]
     However the following packages replace it:
       libical1a


Is this a bug or a problem with my setup?
What should be done?

-- Davide