Freshly installed Ubuntu freezes up after a few minutes
I've installed Ubuntu 18.04 like 70 minutes ago, but I'm having a problem I've never had before; after some minutes of use, the system simply freezes; nothing works at all.
I've tested and only USB devices still function for some time After 1 minute I guess it simply stops, just showing me vvio and with normal HDD noises audible inside the case.
What could be the problem, and how can I fix it?
Actually I think I've found the error; the Firefox package was corrupted. I've uninstalled it completely and reinstalled it, and now it appears that the system is working fine.