Can't install / I get a black screen after loading

Regarding your wifi problem, without knowing what your hardware actually is, we can't provide a specific fix. Can you post the output of the command -

lspci -nn

please? Also check the following page out -

for Broadcom chip wifi. Otherwise see -

https://help.ubuntu.com/stable/ubuntu-help/net-wireless-troubleshooting-hardware-check.html

Good luck Patt_Down.