I like Linux, and this time I installed on old Macbook Pro 2010, however the wifi is not working after Ubuntu installation. Read more how to get working wifi on Ubuntu 20.10
First download these two files
http://mirrors.kernel.org/ubuntu/pool/main/b/b43-fwcutter/b43-fwcutter_015-9_amd64.deb
http://www.lwfinger.com/b43-firmware/broadcom-wl-5.100.138.tar.bz2
and save to Desktop
Open Terminal in Ubuntu and write these commands below, after each line press enter in terminal. After first SUDO command write your login password and press enter!
cd Desktop
sudo dpkg -i b43-fwcutter_015-9_amd64.deb
tar xfvj broadcom-wl-5.100.138.tar.bz2
sudo b43-fwcutter -w /lib/firmware broadcom-wl-5.100.138/linux/wl_apsta.o
sudo modprobe b43
Then reboot
It should work, if not you have different wifi card or some thing else!