[virt-tools-list] reset virt

[Scorpion2185]

Hello,
In order to use virt-manager as root I need to reset it.
The first time that I used it it stated something like:
I need permissions fix error?
Now I reinstalled the system and It kept the settings.
The home folder was not formatted.
How can I delete all preferences? So it will fix that problem, as before.
Thanks
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