robru at rouge in ~/ubuntu/scratch/update-output-helper on bzr:r974                                                                    
$ 
apt-get -oDir=/home/robru/.cache/brapt/aptroot -oDir::State::status=/home/robru/.cache/brapt/aptroot/status install libqgis-core2.4.0
Reading package lists... Done
Building dependency tree... 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 resolve the situation:

The following packages have unmet dependencies:
 libqgis-core2.4.0 : Depends: libgeos-c1 (>= 3.4.2) but it is not installable
E: Unable to correct problems, you have held broken packages.
robru at rouge in ~/ubuntu/scratch/update-output-helper on bzr:r974                                                                    
$ 
apt-get -oDir=/home/robru/.cache/brapt/aptroot -oDir::State::status=/home/robru/.cache/brapt/aptroot/status install libqgis-core2.4.0 libgeos-c1
Reading package lists... Done
Building dependency tree... Done
Package libgeos-c1 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However, the following packages replace it:
  libgeos-c1v5

E: Package 'libgeos-c1' has no installation candidate