You should find an uninstall script in the bin folder of the SNAP installation directory. During the uninstall process to remove all SNAP related data.
The World Wind View causes sometimes trouble on Linux, especially in VMs. This is often caused by the 3D graphics card driver. Updating the driver might help and if you are in a VM it might help to enable 3D support.
You can try to switch the World Wind View in to the flat mode. This can be done in the options panel in the World Wind tab of the General section or paste this property
snap.worldwind.useFlatEarth=true
into the snap.properties file which is located in the etc folder of the SNAP installation directory.
If this still does not help you can remove the World Wind View module:
Delete snap/modules/org-esa-snap-snap-worldwind.jar within the installation directory.
If you then start SNAP you get a warning that this module is missing. Accept it and let SNAP remember the decision.
As a replacement you can use the old world map. You can find it at View / Tool Windows / World Map in the menu or in the toolbar 
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