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I own a laptop (Acer Aspire V3-571G) running Windows 8.1 using an UEFI to boot the system. I've read that changing this to BIOS would cause trouble with Windows, so it is not an option.

First I tried to create a Ubuntu 14.04 LiveUSB with persistence enabled. However I couldn't manage to boot it (it never showed up in the list of bootable devices). A live version of the same distribution however was bootable.

The problem with the LiveUSB version is, that I can't do any permanent changes to the installed packages, which I need to customize. There are a view guides out there telling how to create a custom Linux distribution using Linux tools. However I couldn't find anything on how to do it on a Windows machine.

So how do I setup a custom Ubuntu 14.04 Live-USB on Windows 8.1? Any advice is highly appreciated.

cshubhamrao
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FirefoxMetzger
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2 Answers2

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If you want to support EFI boot mode, you should use Rufus.

First off, download Rufus. Plug in the the Ubuntu ISO and let it churn. Make sure you have it set to GPT partiton scheme for UEFI computers.

When that is done, open up your favorite partition editor that is not on the USB drive. Shrink the partition containing Ubuntu to 1GB. That should be enough. In the remaining unallocated space, create an EXT4 partion named casper-rw. The naming must be exact.

When you reboot, your PC should detect the drive and allow you to use a persistent Ubuntu USB drive on almost any computer in the world.

Note that you must boot with the persistent flag the first time. To do this, simply choose the boot menu edit option (F6) when starting up. Add persistent to the end of the line. Once you are in, mount your USB drive and look for syslinux.cfg. Replace the contents of that file with this:

default persistent
label persistent
  say Booting an Ubuntu Persistent session...
  kernel /casper/vmlinuz
  append  file=/cdrom/preseed/ubuntu.seed boot=casper persistent initrd=/casper/initrd.lz quiet splash noprompt --

Sourced from this answer, this script will make your system boot persistent all the time and remove the "Try/Install" so it boots faster. You can still install Ubuntu to guest sessions using Ubiquity, though.

Community
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Kaz Wolfe
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Warning! This does not give a direct answer to your question but it gives a work-around with some bonus content. Hope it helps.

You can always install Ubuntu in VirtualBox, do your thing there and as a bonus also test your modified Ubuntu in a virtual environment before you even try it out on your real hardware. Booting from a virtual USB is not an issue but as far as I remember you need the Oracle version for the USB support, which is not available in the open source one. When I'm doing stuff like this I always check and double check in VBox. That's why every custom Ubuntu I've managed to create never failed to boot or give me serious headaches on my machine.

Take a look at https://help.ubuntu.com/community/LiveCDCustomization#Testing_the_CD (VBox is mentioned before the Troubleshooting sub-section). Make sure you also read the full article. It's worth it.

Of course testing in VBox does NOT guarantee you a 100% successful deployment especially when it comes to hardware (e.g. you add/remove some driver) but it is definitely the preferable way to do customizations and improve their quality.

EDIT For information on EFI booting see @Whaaaaaat's reply. In addition see @FirefoxMetzger's comment under this reply for the complete chain combining both mine and the reply of @Whaaaaaat for testing and booting the customized Ubuntu Live-USB.

rbaleksandar
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