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Logout from kde and show a black page on Fedora 28 KDE Live x86_64 Virtual machine installed on Qemu and VMware

Hi All!

I installed Fedora 28 KDE Live x86_64 as Virtual Machines  on Qemu/KVM and VMware.

If I input wrong password once on sddm login page . After I logout from Fedora, then the fedora always show me a black screen.

I worked on this problem for serveral days, but I failed.

Can Anyone help me to fix  this problem?

Thanks a lot!