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Parallels Tools 15.1.3 still has this problem, but the above KBUILD_EXTRA_SYMBOLS fix worked for me.
There's a script that's supposed to detect different kernel header versions and set PRL_DRM_VM_OPERATIONS_FAULT_X appropriately in order to make...
The guest tools for 14.1.1 seemed to install ok for me with 4.20.6. Same old gdm problems with Fedora 29, though.