Index: src/wp-admin/js/updates.js
===================================================================
--- src/wp-admin/js/updates.js	(revision 38202)
+++ src/wp-admin/js/updates.js	(working copy)
@@ -350,7 +350,7 @@
 
 		if ( 'plugins' === pagenow || 'plugins-network' === pagenow ) {
 			$updateRow = $( 'tr[data-plugin="' + args.plugin + '"]' );
-			$message   = $updateRow.find( '.update-message' ).addClass( 'updating-message' ).find( 'p' );
+			$message   = $updateRow.find( '.update-message' ).removeClass( 'notice-error' ).addClass( 'updating-message notice-warning' ).find( 'p' );
 			message    = wp.updates.l10n.updatingLabel.replace( '%s', $updateRow.find( '.plugin-title strong' ).text() );
 		} else if ( 'plugin-install' === pagenow || 'plugin-install-network' === pagenow ) {
 			$card    = $( '.plugin-card-' + args.slug );
@@ -900,7 +900,7 @@
 		}, args );
 
 		if ( 'themes-network' === pagenow ) {
-			$notice = $( '[data-slug="' + args.slug + '"]' ).find( '.update-message' ).addClass( 'updating-message' ).find( 'p' );
+			$notice = $( '[data-slug="' + args.slug + '"]' ).find( '.update-message' ).removeClass( 'notice-error' ).addClass( 'updating-message notice-warning' ).find( 'p' );
 
 		} else {
 			$notice = $( '#update-theme' ).closest( '.notice' ).removeClass( 'notice-large' );
@@ -1564,6 +1564,8 @@
 
 		if ( _.isString( response ) ) {
 			error = response;
+		} else if ( 'undefined' !== typeof response.readyState && 0 == response.readyState ) {
+			error = wp.updates.l10n.connectionError;
 		} else if ( _.isString( response.responseText ) && '' !== response.responseText ) {
 			error = response.responseText;
 		} else if ( _.isString( response.statusText ) ) {
@@ -2021,7 +2023,7 @@
 				if ( 'wp-' + response.update + '-update-success' === event.type ) {
 					success++;
 				} else {
-					itemName = response.pluginName ? response.pluginName : $( '[data-slug="' + response.slug + '"]' ).find( '.theme-title strong' ).text();
+					itemName = response.pluginName ? response.pluginName : $( '[data-slug="' + response.slug + '"]' ).find( '.column-primary strong' ).text();
 
 					error++;
 					errorMessages.push( itemName + ': ' + response.errorMessage );
Index: src/wp-includes/script-loader.php
===================================================================
--- src/wp-includes/script-loader.php	(revision 38202)
+++ src/wp-includes/script-loader.php	(working copy)
@@ -679,6 +679,7 @@
 				/* translators: %s: Importer name */
 				'activateImporterLabel'      => __( 'Run %s' ),
 				'unknownError'               => __( 'An unknown error occurred' ),
+				'connectionError'            => __( 'Connection lost or the server is busy. Please try again later.' ),
 				'pluginsFound'               => __( 'Number of plugins found: %d' ),
 				'noPluginsFound'             => __( 'No plugins found. Try a different search.' ),
 			),
Index: tests/qunit/fixtures/updates.js
===================================================================
--- tests/qunit/fixtures/updates.js	(revision 38202)
+++ tests/qunit/fixtures/updates.js	(working copy)
@@ -46,6 +46,7 @@
 		'activateThemeLabel':  'Activate %s',
 		'activateImporter': 'Run Importer',
 		'unknownError': 'An unknown error occurred',
+		'connectionError': 'Connection lost or the server is busy. Please try again later.',
 		'pluginsFound': 'Number of plugins found: %d',
 		'noPluginsFound': 'No plugins found. Try a different search.'
 	}