try reinstalling the package.
Tried - same. Aptitude complained that it can't reinstall because puredata is not installed. So then installed. dpkg grep search has this for puredata-core /usr/bin (not sure why that comes up) /usr/bin/puredata (is not there) /usr/share/puredata (exists) /usr/lib/puredata (folder exists but only contains 'doc, extra, po, tcl' folders) /usr/lib/puredata/bin/pd & pd-watchdog (is not there)
'from which versions of pd did you upgrade? (it might be an upgrading problem)' Unfortunately having tried so many options I can't be totally precise. I tried apt-get via git and attempted to build from source. Also the latest nightly builds of pd-extended, plus the debian repository version. THis was a fresh install but as I said it still has the puredyne install on a separate partition with Pd. I'm somewhat loath to remove it if I'm then going to have no working version of Pd.