I was installing a few things from the repository the other night and it has messed with my settings so much that my mouse cursor has disappeared, my internet (wi-fi) isn't connecting and my desktop resolution has halved in size. I have the unity tweak tool, but without a cursor I'm finding it very difficult to do anything. I've already tried resetting unity through terminal but it's just the same. I have a wireless mouse and a track pad, but they both fail to register with the system. Annoyingly, it's also stopped my internet so I can't install anything. I've tried resetting a few other things but nothing is working and without the mouse cursor it's hard or impossible to do anything to fix it. I'm running an laptop with a Win10 dual boot. Any help would be appreciated.
Edit1: OK, the cursor issue is fixed. But now I've been able to have a look through my entire system, it looks like every piece of hardware connected to my motherboard isn't showing up. Which is why my desktop has reset, my wireless mouse doesn't work, my internet isn't connecting and my sound isn't playing. Looks like something has overwritten all my settings which cover hardware. If this was windows, I'd know what to do. But I'm quite new to Linux.
Edit2: I've run sudo lspci and all my hardware is present and being identified, Ubuntu is just not using any of it. The soundcard is running with a dummy output, my wi-fi card is showing as "no network devices available" and my display seems to be on the most default of modes. I've literally got a computer that's unusable.