- Inspection supervision
With a bootable Ubuntu USB stick, you can:
Install or upgrade Ubuntu, even on a Mac PC
Test out the Ubuntu desktop experience without touching your current PC configuration
Boot into Ubuntu on a borrowed machine or from an internet cafe/cyber cafe
Use tools installed by default on the USB stick to repair or fix a broken configuration
Creating a bootable Ubuntu USB stick is very simple, especially if you're going to use the USB stick/USB Drive with a generic Windows or Linux PC. We're going to cover the process in the next few steps.
Apple hardware considerations for bootable Ubuntu USB stick
There are a few additional considerations when booting the USB stick on Apple hardware. This is because Apple's ‘Startup Manager', summoned by holding the Option/alt (⌥) key when booting, won't detect the USB stick without a specific partition table and layout. We'll cover this in a later step.
You will need:
A 2GB or larger USB stick/flash drive
An Apple computer or laptop running Mac OS
An Ubuntu ISO file. See Get Ubuntu for download links
- Prepare the bootable Ubuntu USB stick
To ensure maximum compatibility with Apple hardware, we're going to first blank and reformat the USB drive using Apple's ‘Disk Utility'. But this step can be skipped if you intend to use the USB drive with only generic PC hardware.
Launch Disk Utility from Applications>Utilities or Spotlight search
Insert your USB stick and observe the new device added to Disk Utility
Select the USB stick device and select Erase from the tool bar (or right-click menu)
Set the format to MS-DOS (FAT) and the scheme to GUID Partition Map
Check you've chosen the correct device and click Erase
Warning: Disk Utility needs to be used with caution as selecting the wrong device or partition can result in data loss.
- Install and run Etcher
To write the ISO file to the USB stick, we're going to use a free and open source application called Etcher. After downloading this and clicking to mount the package, Etcher can either be run in-place or dragged into your Applications folder.
By default, recent versions of Mac OS block the running of applications from unidentified developers. To side-step this issue, enable ‘App Store and identified developers' in the ‘Security & Privacy' pane of System Preferences. If you are still warned against running the application, click ‘Open Anyway' in the same pane.
[caption id="attachment_1346" align="alignnone" width="1342"]bootable Ubuntu USB stick Security & Privacy[/caption]
- Etcher configuration
Etcher will configure and write to your USB device in three stages, each of which needs to be selected in turn:
Select image will open a file requester from which should navigate to and select the ISO file downloaded previously. By default, the ISO file will be in your Downloads folder.
Select drive, replaced by the name of your USB device if one is already attached, lets you select your target device. You will be warned if the storage space is too small for your selected ISO.
Flash! will activate when both the image and the drive have been selected. As with Disk Utility, Etcher needs low-level access to your storage hardware and will ask for your password after selection.
[caption id="attachment_1344" align="alignnone" width="1601"]bootable Ubuntu USB stick Etcher flash Window[/caption]
- Write to device
After entering your password, Etcher will start writing the ISO file to your USB device.
The Flash stage of the process will show progress, writing speed and an estimated duration until completion. This will be followed by a validation stage that will ensure the contents of the USB device are identical to the source image.
When everything has finished, Etcher will declare the process a success.
Congratulations! You now have a bootable Ubuntu USB stick, and ready to go.
Warning: After the write process has completed, Mac OS may inform you that ‘The disk you inserted was not readable by this computer'. Don't select Initialise. Instead, select Eject and remove the USB device.
- Boot your Mac PC from bootable Ubuntu USB stick
If you want to use your bootable Ubuntu USB stick with an Apple Mac, you will need to restart or power-on the your Mac PC with the USB stick inserted while the Option/alt(⌥) key is pressed.
This will launch Apple's ‘Startup Manager' which shows bootable devices connected to the machine. Your USB stick should appear as gold/yellow and labelled ‘EFI Boot'. Selecting this will lead you to the standard Ubuntu boot menu.