i have ghc6_6.6.1-2ubuntu2_i386.deb and ghc6-prof_6.6.1-2ubuntu2_i386.deb installed, but i cant seem to get mtl to install, can someone tell me what this output means? i just switched to a debian based system from gentoo, so i dont grok dpkg yet: aeyakovenko@snowcrash:~$ sudo dpkg -i libghc6-mtl-dev_1.0.1-2_i386.deb (Reading database ... 129709 files and directories currently installed.) Preparing to replace libghc6-mtl-dev 1.0-3 (using libghc6-mtl-dev_1.0.1-2_i386.deb) ... ghc-pkg: cannot find package mtl-1.0 dpkg: warning - old pre-removal script returned error exit status 1 dpkg - trying script from the new package instead ... ghc-pkg: cannot find package mtl-1.0 dpkg: error processing libghc6-mtl-dev_1.0.1-2_i386.deb (--install): subprocess new pre-removal script returned error exit status 1 Reading package info from stdin ... done. ghc-pkg: dependency base-2.0 doesn't exist (use --force to override) dpkg: error while cleaning up: subprocess post-installation script returned error exit status 1 Errors were encountered while processing: libghc6-mtl-dev_1.0.1-2_i386.deb