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Can I create a bootable USB stick using an Apple Macbook? Then can I use that stick to upgrade a windows PC to a ubuntu version.

New Method using Etcher

1. Make sure you have a USB Stick with at least 4GB of free space.


2. Get your Ubuntu ISO from here.


3. Open Disk Utility from Applications > Utilities
   


4. Select the USB stick and select Erase (This will remove all data stored on the USB drive)


5. Select the format: MS-DOS (FAT) and scheme: GUID Partition Map
   


6. 
   

   Click Erase

   
   
   

   

   
   


7. Download, install and open Etcher (By default MacOS blocks running apps from unidentified developers. Follow this tutorial if you are experiencing problems with this.)


8. Select image and navigate to the location you saved the Ubuntu ISO you have downloaded in step 2


9. Select the USB drive you have formatted in step 3-6.


10. 
    

    Click Flash

    
    
    

    

    
    


11. Congratulations! You now have Ubuntu on a USB stick, bootable and ready to go!

Old Method using UNetbootin (might still work)

1. Make sure you have a USB Stick with at least 4GB of free space.


2. Download and install UNetbootin USB installer
   


3. Download The Ubuntu Desktop ISO of your choice


4. 
   

   Launch UNetbootin and allow the osascript to make changes

   
   
   

   

   
   


5. 
   

   Select the Diskimage radio button and then click the ... button

   
   
   

   

   
   


6. 
   

   Select the ubuntu ISO file you downloaded and click 'Open'

   
   
   

   

   
   


7. Then select your flash drive in the bottom row and click 'OK'


8. After Unetbootin finishes, click 'Exit' and now you have yourself an Ubuntu USB stick.

Source

1) Find the file path to your USB drive with

diskutil list external

You're looking for /dev/diskN. It's probably /dev/disk2, but double check that the NAME and SIZE columns make sense. The dd command you're going to run later will effectively delete all data on the drive so don't get this wrong. If that command produces no output, your USB drive is probably not plugged in.

2) Unmount the device so you can overwrite it (change N to the number you got from the last step)

diskutil unmountDisk /dev/diskN

3) Use dd to copy the .iso image to the USB with

sudo dd if=/path/to/your/iso-file.iso of=/dev/diskN

That step will take a while. When it's finished you might get an error saying that the disk can't be read, you can click "Eject" and you're done; use your USB stick to boot Ubuntu. If you don't get that error, you should eject it with diskutil eject /dev/diskN.

You can speed up the dd command by adding bs=1m (if you get an unrecognized option error it's because you installed a newer version of coreutils with homebrew, change "m" to an uppercase "M") and using /dev/rdiskN instead of /dev/diskN (use /dev/diskN for the diskutil commands though). You can get dd to report progress with status=progress. This would all look like

sudo dd bs=1m status=progress if=ubuntu-18.04-desktop-amd64.iso of=/dev/rdiskN

With my cheap USB 2.0 drive I get 3.6 MB/s (9 minutes) with these options vs 800 kB/s (40 minutes) without them.

Format your USB stick in FAT32 then open a terminal and type

dd if=/path/to/file.iso of=/path/of/mounted/usb

Substitute the strings after = signs with your real paths.

That's really quicker than other method!

Well, yes, you can. Look for the correct tool to do this, like unetbooting. For more information about, how to create a bootable USB you can look at this:

How to create a bootable USB stick on OS X.

And here: How do I create a bootable flash drive for installing Windows?,

And here: How to create a Windows 10 installer USB drive from a Mac.

sudo dd if=/path/to/file.iso of=/dev/disk3

where disk3 is your usb device.
You need to umount the usb device before performing this operation.

dd is a dangerous command and can erase your disk completely. of=/dev/diskx
this x should never be your internal disk. Make sure you have not put your internal disk after "of=/dev/"