Public bug reported:

By a desktop version and installed UI Toolkit and SDK Libs no Touch Apps (e.g. 
Touch-Minesweeper) cant be started.
The error that is shown is: qmlscene: could not find a Qt installation of ''

It seems, that QT_SELECT is set to '' by default on desktops.

Workaround: find the qt Version with
qtchooser -list-versions
and edit ~/.profile (or similar) to export global QT_SELECT to the right 
version.
or to pass the qt version over arguments in the starting command like:
qmlscene -qt=qt5-x86_64-linux-gnu /usr/share/minesweeper-touch/minesweeper.qml

Tested on: Ubuntu 13.10 Server + XFCE4 + touch-collection + ubuntu-sdk-
libs +  ubuntu-ui-toolkit

The possibility to start that apps is important for convertible
notebooks like Lenovo X220 Tablet, some  HP tablet a.s.o.

** Affects: ubuntu-ui-toolkit (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apps core desktop touch

** Description changed:

- By a desktop version and installed UI Toolkid and SDK Libs no Touch Apps 
(e.g. Touch-Minesweeper) can be started.
+ By a desktop version and installed UI Toolkit and SDK Libs no Touch Apps 
(e.g. Touch-Minesweeper) can be started.
  The error that is shown is: qmlscene: could not find a Qt installation of ''
  
  It seems, that QT_SELECT is set to '' by default on desktops.
  
  Workaround: find the qt Version with
- qtchooser -list-versions 
+ qtchooser -list-versions
  and edit ~/.profile (or similar) to export global QT_SELECT to the right 
version.
  or to pass the qt version over arguments in the starting command like:
  qmlscene -qt=qt5-x86_64-linux-gnu /usr/share/minesweeper-touch/minesweeper.qml
  
  Tested on: Ubuntu 13.10 Server + XFCE4 + touch-collection + ubuntu-sdk-
  libs +  ubuntu-ui-toolkit
  
  The possibility to start that apps is important for convertible
  notebooks like Lenovo X220 Tablet, some  HP tablet a.s.o.

** Description changed:

- By a desktop version and installed UI Toolkit and SDK Libs no Touch Apps 
(e.g. Touch-Minesweeper) can be started.
+ By a desktop version and installed UI Toolkit and SDK Libs no Touch Apps 
(e.g. Touch-Minesweeper) cant be started.
  The error that is shown is: qmlscene: could not find a Qt installation of ''
  
  It seems, that QT_SELECT is set to '' by default on desktops.
  
  Workaround: find the qt Version with
  qtchooser -list-versions
  and edit ~/.profile (or similar) to export global QT_SELECT to the right 
version.
  or to pass the qt version over arguments in the starting command like:
  qmlscene -qt=qt5-x86_64-linux-gnu /usr/share/minesweeper-touch/minesweeper.qml
  
  Tested on: Ubuntu 13.10 Server + XFCE4 + touch-collection + ubuntu-sdk-
  libs +  ubuntu-ui-toolkit
  
  The possibility to start that apps is important for convertible
  notebooks like Lenovo X220 Tablet, some  HP tablet a.s.o.

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https://bugs.launchpad.net/bugs/1242883

Title:
  core apps doesnt start on dektop version

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