When you first install QT, the "No valid kits found" solution is created when you create the project __ software compile installation record

Use the Qt 5.8 online installer after installation on Ubantu Kylin.

Use QT Creator to create a default QT Widgets application.

Project Wizard run to Kit Selection can't go on. Error prompts the following figure:

No valid kits found.

Follow the prompts to click "Options" and see the Manual Settings/desktop (default) preceded by an exclamation mark. It means there's something wrong with this kit.

Look at its contents, the QT version parameter value is: QT 5.6.1 in PATH (QT5) (invalid)

The QT Creator is visible by default to find Qt 5.6.1, but cannot be found.

Click on the right side of the "Manage ...", to the following figure,

A line of Qt 5.6.1 in PATH (QT5) with an exclamation mark is automatically detected/usr/lib/x86_64-linux-gun/qt5/bin/qmak

It is further explained that no suitable qmake can be found.

Considering that when installing QT, the installation path is OPT/QT, only QT 5.8 is installed by default, so click "Add"

Add "/opt/qt/5.8/gcc_64/bin/qmake" to the Qt versions.

In this way, there is one more of the manual settings for Qt versions,

Qt 5.8.0 (gcc_64)/opt/qt/5.8/gcc_64/bin/qmake

Then go back to the Build Suite (Kit) page and set the qt Version parameter to QT 5.8.0 (gcc_64).

In this way, the exclamation mark in front of the manual setup/desktop (default) disappears.

Click "OK" to save, back to the Kit Selection interface, click on "Previous" and "Next", the kit Selection interface appears "desktop" this kits option. Select it,

can go on.