Paraview, OpenFoam Error.

I installed OpenFoam 2306 and paraview 5.11 from official sites. initaly i got the error as :

Invalid $PV_PLUGIN_PATH and -plugin-path= not defined No supplementary ParaView/OpenFOAM reader modules Using builtin reader: paraFoam -vtk

Created temporary 'pitzDaily.foam' qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found. This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: xcb.

But after i executed sudo apt-get install libqt5x11extras5, now i am getting this error:

Invalid $PV_PLUGIN_PATH and -plugin-path= not defined No supplementary ParaView/OpenFOAM reader modules Using builtin reader: paraFoam -vtk

Created temporary 'pitzDaily.foam'

Help me with this. I'm a newbie to OpenFoam.