I encountered these two issues on Neon GNU/Linux with KDE Plasma 5.10.3 on Qt Creator 4.3.0 & Qt Framework 5.9. When I installed Creator from Neon repo (not Ubuntu repo), it shows no examples at all and also it failed to create new Qt Widget project saying "No Valid Kits Found". I solved these issues by simple workarounds below:

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To Solve "No Examples" Issue


This problem arises because merely installing Creator doesn't install the examples files themselves. So, install them by command line:
sudo apt-get install qtbase5-examples qtbase5-doc-html

To Solve "No Kits" Issue


This solved by installing qt5-default package:
sudo apt-get install qt5-default

and restarting Creator should give you both the Examples and ability to create new projects.

Result


If you performed both workarounds above, you should see Creator shows examples now:


and it can make new project (Qt Widget) now:


Extras


Here the details of installed Creator on my system. We know that all packages here come from Neon repo (not Ubuntu repo) with very-very latest versions:

qtbase5-examples:

master@master:~$ apt-cache policy qtbase5-examples
qtbase5-examples:

  Version table:
 *** 5.9.0-0neon+16.04+xenial+build18 500
        500 http://archive.neon.kde.org/user xenial/main amd64 Packages


qtbase5-doc-html:

master@master:~$ apt-cache policy qtbase5-doc-html
qtbase5-doc-html:

  Version table:
 *** 5.9.0-0neon+16.04+xenial+build18 500
        500 http://archive.neon.kde.org/user xenial/main amd64 Packages
        500 http://archive.neon.kde.org/user xenial/main i386 Packages
        500 http://archive.neon.kde.org/user xenial/main all Packages

qtcreator:

master@master:~$ apt-cache policy qtcreator
qtcreator:

  Version table:
 *** 4.3.0-0neon+16.04+xenial+build7 500
        500 http://archive.neon.kde.org/user xenial/main amd64 Packages

qt5-default:

master@master:~$ apt-cache policy qt5-default
qt5-default:

  Version table:
 *** 5.9.0-0neon+16.04+xenial+build19 500
        500 http://archive.neon.kde.org/user xenial/main amd64 Packages

References



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