Who freezes my laptop?

After reboot, suddenly my laptop cannot boot :-(

Then, tried to login rescue mode but root account is disabled.

Then, use USBstick to boot Ubuntu and mount encrypted volume, make root enabled.

After checking syslog, libvirt calls dmidecode and it seems that  something is wrong with it.

Removed gnome-boxes and libvirt*, reboot my system and I can see login dialog by gdm3.

However, after login, I tried to exec dmidecode but nothing happened.

Also installing gnome-boxes and libvirt* packages and reboot is okay.

Okay, back to nomal. But....hmmm...? Who stole my time??