"Showcase galllery" is not working on 16.04 LTS

[XiaoGuo, Liu]

I just installed the latest SDK on 16.04. I tried to launch the "Showcase gallery" app from the Ubuntu SDK, but it was not launched. It complained that:

[15:24:23] Started /usr/ubuntu-sdk-ide/share/qtcreator/ubuntu/scripts/qtc_launch_gallery
[15:24:23] Run from IDE

[15:24:23] Could not find the ubuntu-ui-toolkit examples, please make sure they are installed

[15:24:23] /usr/ubuntu-sdk-ide/share/qtcreator/ubuntu/scripts/qtc_launch_gallery: line 20: /usr/ubuntu-sdk-dev/bin/qmake: No such file or directory

[15:24:23] /usr/ubuntu-sdk-ide/share/qtcreator/ubuntu/scripts/qtc_launch_gallery: line 20: /usr/ubuntu-sdk-dev/bin/qmake: No such file or directory

[15:24:23]
[15:24:23] /usr/ubuntu-sdk-ide/share/qtcreator/ubuntu/scripts/qtc_launch_gallery finished with code 1

[fcole90 (fcole90)]

This bug is a duplicate of https://bugs.launchpad.net/ubuntu/+source/qtcreator-plugin-ubuntu/+bug/1551261