I can confirm this. After upgrade from Ubuntu 6.06 to 7.04 I noticed some 
delays between invoking ssh (in the shell) and password prompt.
I do some search with Wiershark, and I could see that client key exchange init 
time delta from previous packet is over 10 sec., i.e:
pkt 10: SSH v2 Server: Key Exchange Init, Time delta from previous packet = 
0.015022000 s.
pkt 11: Client to Server ACK, Time delta from previous packet = 0.039764000 s.
pkt 12: SSH v2 Client: Key Exchange Init, Time delta from previous packet = 
10.89677000 s.
I've installed krb5-config as Dimitriy suggest, and client key exchange init 
time delta is reduced to 0.040810000 s. or less.

I think it is not a good idea to recomplie openssh-client without
kerberos support. The better way, IMHO, is to include krb5-config
package as dependency for openssh-client pkg.

-- 
Long delays on SSH login from an Ubuntu system
https://bugs.launchpad.net/bugs/111553
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