I installed the package libfftw3-doc in order to get the info form of the fftw documentation.
In installed it via sudo apt-get install ...... libfftw3-doc (I installed several other libfftw3 packages at the same time.) I can see a pair of lines in the output that say Setting up libfftw3-doc (3.3.5-3) ... Processing triggers for install-info (6.3.0.dfsg.1-1+b2) ... And if i run info, either stand alone or as an inferior to emacs, i can see an entry for fftw3, which is described as the FFTW User's Manual. This is at top level (the dir node). Nevertheless, when i try to to run the Info-menu command on it (i.e., type 'm'), i get a message Can't find fftw3.info-1 or any compressed version of it (which comes from info-insert-file-contents). (In the stand-alone version of info, i get the shorter message "Cannot find node ''.") I tried doing update and then dist-upgrade to make sure i didn't have some broken package, but that made no difference. I tried removing and installing the package again, with the same behavior inside emacs. So i would like to get some more details about what apt is actually doing so i can figure out what to do. At least that's what i think would be the right step to take. TIA for any suggestions on how to proceed. dan