According to Cordell

Netatalk fix for Ubuntu 12.04

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Ubuntu 12.04 breaks netatalk and when you try to login in to the apple share you will get errors such as this in /var/log/syslog:

Jun 14 13:03:13 GlaDoS afpd[4395]:
===============================================================
Jun 14 13:03:13 GlaDoS afpd[4395]: INTERNAL ERROR: Signal 11 in pid 4395 (2.2.1)
Jun 14 13:03:13 GlaDoS afpd[4395]:
===============================================================
Jun 14 13:03:13 GlaDoS afpd[4395]: BACKTRACE: 3 stack frames:
Jun 14 13:03:13 GlaDoS afpd[4395]:  #0 /usr/sbin/afpd(netatalk_panic+0x1c)
[0x7f68fcf6baec]
Jun 14 13:03:13 GlaDoS afpd[4395]:  #1 /usr/sbin/afpd(+0x50bec) [0x7f68fcf6bbec]
Jun 14 13:03:13 GlaDoS afpd[4395]:  #2 /lib/x86_64-linux-gnu/libc.so.6(+0x364a0)
[0x7f68fbf264a0]

After some hunting and googling you can find that it is broken. The workaround can be found on the bug page.

The best answer is at #28.

More explicitly, here is the solution:

sudo cp /etc/pam.d/common-auth /etc/pam.d/common-auth-nosmb
sudo cp /etc/pam.d/common-password /etc/pam.d/common-password-nosmb

Now edit the file /etc/pam.d/netatalk. Changes:

- @include common-auth
+ @include common-auth-nosmb
- @include common-password
+ @include common-password-nosmb

Now just restart netatalk and it will work:

sudo service netatalk restart