Problem installing liberty-eiffel on WSL

[Jan-Eric Nitschke]

Hi,

i am currently trying to install liberty-eiffel on WSL.
I have added this line to my sources.list file "deb [trusted=yes] 
http://apt.liberty-eiffel.org/ release main".

Afterwards i do
```
sudo apt-get update
sudo apt-get install liberty-eiffel-all
```
However, i only receive this error:
The following packages have unmet dependencies:
 liberty-eiffel-all : Depends: liberty-eiffel-tools (= 2016.05~release) 
but it is not installable
E: Unable to correct problems, you have held broken packages.

I would appreciate any help.

Cheers
Jan-Eric