Yes I will stay on the 5.9 version of paraview instead using paraFoam which launch paraview 5.6.
You may also wish to use one of the OpenFOAM Ubuntu packages that we maintain:
Here are the installation instructions.
Note that this one has a finely granulated set of sub-packages, so you install as much as you need.
The openfoam shell session makes it easy to quickly run a different version.
The openfoam-selector provides a mechanism for more permanent switching of versions.