Ububtu on a macbook.built in track pad and mouse don't work

[M.R.P.]

Hello I am trying to install the latest ubuntu on a macbook.I am doing 
the install via usb. When I get to the screen that asks for my location 
my macbook trackpad does not work and my built in keyboard does not 
work. The macbook has a usb-c port for external devices.

     I have had a similar problem getting ubuntu to work on a mac 
desktop. The mac keyboard and mouse did not work. I used a usb IBM 
keyboard and mouse and that solved my problem. Not sure what to do with 
the macbook..I can get into the grub minimal bash line at startup. I do 
not have a usb-c multiport adapter I wias thinking perhaps not having 
the keboard and mouse plugged in may not allow the devices to be 
recognized. Or do I need to issue a command in startup minimal bash to 
solve the problem. Any ideas would be apreciatied.