When I send [start( to [pd~] I get "tcl: /usr/lib/bin/pd.tk: can't open script" in the command window.
since /usr/lib/bin/pd.tk didn't exist I tried ln -s /usr/lib/pd-extended/bin/pd.tk /usr/lib/bin/pd.tk
still no go. I had also been getting other variations of file not found for watchdog and pd-gui but symbolic links appeared to fix those: ln -s /usr/lib/pd-extended/bin/pd-watchdog /usr/lib/bin/. ln -s /usr/lib/pd-extended/bin/pd-gui /usr/lib/bin/pd-gui
pd 0.42.5-extended downloaded as a binary from the pd site, running on ubuntu Maverick
John