I have a Raspberry Pi 2 model B V1.1 and I want to download Ubuntu onto the Pi with it's existing 8GB SD card or with an 16GB USB. Can someone please help me?
Download Ubuntu Mate for RPi 2 from here. As you said that only your MacBook has SD card slot you will have to do it there (or buy SD card adapter to use it on Win 10 computer). The downloaded file is compressed (zip) so it has to be un-ziped first (I do not own Apple, but I was told that by double-clicking on the zip file it should automatically unzip it into the same folder). Than insert your SD card (make sure that write-protection pin is not on). You need to know what "name" has been given to SD by your computer (
N is a number). Write to command line:
Find your SD card. Be sure that this is SD. If you get this wrong you could write the image to your system disk and make your MacBook a brick).
Unmount the SD with:
diskutil unmountDisk /dev/diskN ... change
N to the number you found from above command.
And now transfer the unzipped Ubuntu Mate image to SD card:
dd if=/path/to/ubuntu-mate-mage-for-raspberry-pi.img of=/dev/diskN bs=1m
N to the number you found in
Note that it can take a while.