Comment 3 for bug 2053146

Verifying this should be fairly simple.

Look at the definition of Authmethod in auth.h and compare to how method_gssapi is initialized compared to method_gsskeyex.

As for it being the only report it is only "AuthenticationMethods gssapi-keyex" that is not working.
We have "AuthenticationMethods gssapi-keyex gssapi-with-mic" so on Jammy it still works but we get complaints in the log, like this:
===
error: Disabled method "gssapi-keyex" in AuthenticationMethods list "gssapi-keyex"
Authentication methods list "gssapi-keyex" contains disabled method, skipping
===

Regarding Noble, the patch for this in openssh_9.6p1-3ubuntu1.debian.tar.xz is still having the same problem with the initialization of method_gsskeyex.

===
@@ -333,6 +377,12 @@ input_gssapi_mic(int type, u_int32_t plen, struct ssh *ssh)
        return 0;
 }

+Authmethod method_gsskeyex = {
+ "gssapi-keyex",
+ userauth_gsskeyex,
+ &options.gss_authentication
+};
+
 Authmethod method_gssapi = {
        "gssapi-with-mic",
        NULL,
===

Note that there is still only three arguments in the init of method_gsskeyex vs the required four.