I met the same problem on my fedora, though not knowing the reason, I solved it by add nouveau into blacklist.

?1????????nouveau ? ?su?????root???:

• su root
• vim /lib/modprobe.d/dist-blacklist.conf`

?nvidiafb????

• #blacklist nvidiafb ?????????

blacklist nouveau
options nouveau modeset=0


?2? ??initramfs image????????

mv /boot/initramfs-$(uname -r).img /boot/initramfs-$(uname -r).img.bak
dracut -v /boot/initramfs-$(uname -r).img $(uname -r)


?4???????????nouveau?????? lsmod | grep nouveau
?????????????

I forgot where i find this way, and manage to solve many problems with GUI (you must repeat the operation everytime you update the kernel)

``` (1)forbiid nouveau

su root
vim/lib/modprobe.d/dist-blacklist.conf

add # before blacklist nvidiafb

#blacklist nvidiafb

then insert:

blacklist nouveau
options nouveau modeset=0


(2)rebuild initramfs image?recommend copy directly?

mv /boot/initramfs-$(uname -r).img /boot/initramfs-$(uname -r).img.bak
dracut -v /boot/initramfs-$(uname -r).img $(uname -r)


(4)then after computer, restarted

lsmod | grep nouveau
it will ok if there is not any output

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Its because of the libvirtd service. Check if the service is up and try again in GUI.

# service libvirtd start