stop tftpd-hpa on ubuntu

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@13964 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-server/lib/xcat/plugins/AAsn.pm

@@ -1503,6 +1503,9 @@ sub enable_TFTPhpa
 
     if (-x "/usr/sbin/in.tftpd") {
 	system("killall in.tftpd"); #xinetd can leave behind blocking tftp servers even if it won't start new ones
+    if ($distro !~ /ubuntu.*/i){
+            system("stop tftpd-hpa");
+    }
         my @tftpprocs=`ps axf|grep -v grep|grep in.tftpd`;
 	while (@tftpprocs) {
 		sleep 0.1;