Default wallpaper Settings didn't take effect in livecd

[ShuiLu Pi]

安装UbuntuKylin系统时，启动ubiquity后，默认壁纸没有生效；在安装开始时选择“试用”，发现默认壁纸是生效的。
When install UbuntuKylin system,after start the ubiquity, the default wallpaper has no effect; Choose "try" at the beginning of the installation, found the default wallpaper is effective.

[Ma Jun (maclin.jun)]

我测试的结果是：
启动ubiquity后选择试用，壁纸也没有生效;
启动开始时直接选择试用，壁纸也没有生效;
安装后壁纸依然没有更新。

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1226441

[zhangchao (zctgbhu)]

这应该是因为系统的“由文件管理器处理桌面”（show-desktop-icons）被设为false导致的，桌面没有“安装ubuntukylin”图标，无法使用右键，没有壁纸等问题是这个设置导致的。
Because the “show-desktop-icon”（org.gnome.desktop.background）is false.

[Ma Jun (maclin.jun)]

This error appears in the latest daily ISO(20130925) when start live mode from ubiquity install wizard（show in the attachment1） , meanwhile the desktop icon and right click menu also does not take effect.

However, when I start live from the installation menu, the above problem disappears in VirtualBox(show in the attachment2). The problem still exists in physical machine.

[Ma Jun (maclin.jun)]

This problem is caused by default wallpaper name change in ubuntukylin-default-settings. We change it from "ubuntukylin-default-settings.jpg" to "warty-final-ubuntukylin.jpg" according to name rules. But in ubiquity-dm of ubiquity it search the wallpaper by "ubuntukylin-default-settings.jpg". The codes are showed as following:

            for background in (
                    '/usr/share/backgrounds/edubuntu_default.png',
                    '/usr/share/xfce4/backdrops/ubuntustudio-1310.png',
                    '/usr/share/xfce4/backdrops/xubuntu-wallpaper.png',
                    '/usr/share/lubuntu/wallpapers/'
                    'lubuntu-default-wallpaper.png',
                    '/usr/share/backgrounds/ubuntukylin-default-settings.jpg',
                    '/usr/share/backgrounds/warty-final-ubuntu.png',
                    '/usr/share/backgrounds/gnome/FootFall.png'):