libshell-perl : Depends: perl but it is not going to be installed

[oxy]

Hi,

i have perl installed and running in my ubu 12.04.
But cannot install  libshell-perl. Pls see code bellow:

#----------------- start code --------------------
prompt> sudo apt-get install libshell-perl
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libshell-perl : Depends: perl but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
#------------------ end of code -------------------------------

Any idea? Must be happening in other ubus 12.04 as well
but google doesnt find any  :-/

thx...