$ sudo apt-get install qttools5-dev-tools
$ sudo apt-get install qttools5.dev

$ sudo apt-get install g++
$ sudo apt-get install libpython-dev
	
$ wget https://sourceforge.net/projects/pyqt/files/sip/sip-4.19.13/sip-4.19.13.tar.gz
$ tar xzvf sip-4.19.13.tar.gz
$ cd sip-4.19.13
$ python configure.py
$ make 
$ sudo make install
$ cd ../

// Make sure Qt5 is installed:
$ qtchooser -list-versions

// Select the Qt version:
$ export QT_SELECT=qt5

// Check qmake version:
$ qmake --version

$ wget https://sourceforge.net/projects/pyqt/files/PyQt5/PyQt-5.11.3/PyQt5_gpl-5.11.3.tar.gz
$ tar xzvf PyQt5_gpl-5.11.3.tar.gz
$ cd PyQt5_gpl-5.11.3
$ python configure.py --no-tools 
$ make 
$ sudo make install

// Add to the end of the file ~/.bashrc next line:
export PYQTDESIGNERPATH='/usr/lib/python2.7/dist-packages/qtvcp/plugins/'
############################################################################

Thanks Cris for this help

For the link i do this
sudo ln -s /usr/lib/python2.7/dist-packages/qtvcp/plugins/qtvcp_plugin.py /usr/lib/x86_64-linux-gnu/qt5/plugins/designer/

I am not sure if this is right way to do link?? 

#################################################

I always do the link with the GUI ....
No the second path should be :
/usr/lib/x86_64-linux-gnu/qt5/plugins/designer/python
or
~/.designer/plugins/python

Did you confirm those are the correct paths? Different systems have slightly different paths. 

##############################################

Thanks Cris, That was my fault, Widgets now show up

Thanks for Great support