hello
trying to get PD to work on a RaspberryPI with the Wolfson audiocard.
At the moment I am following this procedure:
http://journeytounknownsoundscapes.blogspot.nl/2014/05/using-raspi-wolfson-audio-card-and-pure.html

but keep getting a message
W: GPG error: http://apt.puredata.info wheezy Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9F0FE587374BBE81

would someone know where to find further info on this

also tried "apt-get install puredata", which installs fine and opens and runs sound if one chooses NOT to use the WolfsonCard , with the card chosen I get "I/O stuck"

any suggestions to get pd working here are very welcome
thanks in advance
Vilbjørg

Got it working for some (for me unknown ) reason the pd audio problem was solved by changing raspi-config :: not logging directly onto a desktop but start from text console, then 'startx' to get a desktop and then I l started pd interface or nogui from the terminal

so the process is simple:
1. OS img (including the wolfson drivers) https://docs.google.com/file/d/0BzIaxMH3N5O1RUdSa19od1ltTjg/edit?pli=1 (this is made by Ragnar Jensen, the 'official' image must be corrupted, I spent several days trying to download it and decompress it without success)
2014-01-07-wheezy-raspbianW.img onto sdcard (I unzipped .zip on debian, macos wouldn't do it for me with this file)
2. start raspberry pi with sdcard and (important for pd) by configuration just choose to boot to the text console.
3. reboot, "startx" to launch desktop
4. open terminal
5. "apt-get update"
"apt-get install puredata"
5. pd (the wolfson card is even default in pd preferences)