broken "Ubuntu SDK Desktop Kit" target with the latest SDK on vivid

[XiaoGuo, Liu]

I am using Ubuntu OS 15.04, and I have installed the SDK at the instruction here at: https://developer.ubuntu.com/en/start/ubuntu-sdk/installing-the-sdk/

Before I did my SDK installation, I have wiped my previously installed SDK in the following steps:

- sudo apt-get remove qtcreator qtcreator-plugin*
- sudo dpkg --purge qtcreator-plugin-ubuntu
- Remove the chroots (i386/armhf) and reinstall the chroots

I tried to make sure that it was a clean installation.

Now, when run any of the scopes generated by the SDK templates, and I cannot see any of the contents in the scope there. The captured picture is like one as shown in the attachment.

liuxg@liuxg:~$ apt-cache policy ubuntu-sdk-ide
ubuntu-sdk-ide:
  Installed: 3.5.0+15.10.20151024-0ubuntu1~97+201511170914~ubuntu15.04.1
  Candidate: 3.5.0+15.10.20151024-0ubuntu1~97+201511170914~ubuntu15.04.1
  Version table:
 *** 3.5.0+15.10.20151024-0ubuntu1~97+201511170914~ubuntu15.04.1 0
        500 http://ppa.launchpad.net/ubuntu-sdk-team/ppa/ubuntu/ vivid/main amd64 Packages
        100 /var/lib/dpkg/status

After installing the following package, everything works:
sudo apt-get install ubuntu-ui-toolkit-theme