Comment 33 for bug 810732

I was seeing this same crash on every attempt to connect via afp to the server. I stumbled across this post and figured out a workaround:

http://www.rudiswiki.de/wiki9/ServerUbuntu1204#Setup_netatalk

Using this line in /etc/netatalk/afpd.conf, the crash goes away. -mimicmodel RackMac seems to be the key. I don't know why...

- -tcp -noddp -uamlist uams_dhx.so,uams_dhx2_passwd.so -nosavepassword -advertise_ssh -mimicmodel RackMac