If I try to specify the baud rate I get this:
sudo avrdude -c avrisp -p atmega32 -b 19200 -P /dev/ttyACM0
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.12s
avrdude: Device signature = 0x000000
avrdude: Yikes! Invalid device signature.
Double check connections and try again, or use -F to override
this check.
avrdude done. Thank you.