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I have Dell 5558 laptop with Windows 8.1 pre-installed. I want to install Ubuntu 14.04 alongside windows, so I downloaded the iso image. I then formatted my pendrive then using universal USB Installer I copied it to my USB and made it bootable. But after restarting I get grub> command line screen when I try to boot through my pendrive.

I dont know how to proceed afterwards. I have tried using ls command to find all directories, I get hd0 hd1 hd2 hd2,gpt1..7,hd3. But when I try to access them it shows undefined directory. hd2,gpt1 and hd2,gpt2 have some folders like Windows/ Boot/ Efi. In the Boot/ folder there is a file named boot.efi.(something). I dont remember exactly.

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1) Your USB drive needs to be formatted as FAT32

2) I found https://rufus.akeo.ie/ to be very reliable for UEFI (recent, > 2009) systems (this may not be the case with universal USB installer)

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Tools to create bootable USB drives from .iso files are not created equal. I'm not very familiar with the one you mention, so I can't comment on it specifically; but as a general rule, if you run into problems like those you describe, one of the first things (perhaps the first thing) I recommend doing is re-creating the USB drive with another tool. I generally use dd in Linux to make the drive; but Rufus (as Smile4ever recommends) and Unetbootin both seem to work pretty well. Even they might fail sometimes, though; unfortunately, some computers are just plain finicky, and if a disk isn't exactly to the firmware's liking, it might not boot or might exhibit other problems.

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I have checked some Dell Manuals and I guess there should be something wrong with your USB Installer or ISO Image and you should try to format your USB as FAT32

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