Sudo asks for password twice with LDAP authentication
Solution 1:
in PAM there is an option called "use_first_pass" :
auth sufficient pam_ldap.so use_first_pass
try enabling it for ldap, should fix your issue
Solution 2:
Try to change this line:
auth sufficient pam_winbind.so
to
auth sufficient pam_winbind.so try_first_pass
Solution 3:
I have the same problem and removing:
auth sufficient pam_unix.so nullok
from /etc/pam.d/common-auth and adding:
auth sufficient pam_ldap.so use_first_pass
solved the problem :-).