--- doc/install/linux/install.pl	2020/05/03 00:33:56	1.66
+++ doc/install/linux/install.pl	2020/07/08 17:19:10	1.67
@@ -77,7 +77,7 @@ if (!open(LOG,">>loncapa_install.log"))
           &mt('Stopping execution.')."\n";
     exit;
 } else {
-    print LOG '$Id: install.pl,v 1.66 2020/05/03 00:33:56 raeburn Exp $'."\n";
+    print LOG '$Id: install.pl,v 1.67 2020/07/08 17:19:10 raeburn Exp $'."\n";
 }
 
 #
@@ -3177,7 +3177,7 @@ sub copy_apache2_debconf {
         my $apache2_conf_available_dir = '/etc/apache2/conf-available';
         my $defaultconf = $apache2_conf_enabled_dir.'/loncapa.conf';
         if ((-e "$apache2_conf_available_dir/loncapa") && (-e "$instdir/debian-ubuntu/ubuntu14/loncapa_conf")) {
-            if (open(PIPE, "diff --brief $apache2_conf_available_dir/loncapa $instdir/debian-ubuntu/ubuntu14/loncapa_conf" |")) {
+            if (open(PIPE, "diff --brief $apache2_conf_available_dir/loncapa $instdir/debian-ubuntu/ubuntu14/loncapa_conf |")) {
                 my $diffres = <PIPE>;
                 close(PIPE);
                 chomp($diffres);