install libheap-perl lapack-pic cecilia multicd sound-recorder Reading package lists... Building dependency tree... Reading state information... 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: lapack-pic : Depends: libc6-dev but it is not going to be installed Depends: atlas2-base-dev but it is not going to be installed or blas-dev but it is not going to be installed or blas2-dev x11-common : Breaks: gdm (< 2.20.7-5) but 2.6.0.8-1sarge2 is to be installed E: Broken packages