Having trouble booting to USB to install Ubuntu

Hi I have a an Acer Aspire 5253-BZ660 running Windows 7 and I'm trying to install Ubuntu from USB. I copied the .ISO file to the USB. I have also gone into the BIOS and set it to boot to USB first. I've also disabled QuickBoot and Enabled F12 for Boot Options. When it boots, I hit F12. I'll select the USB I want to boot from and the computer will then start loading Windows; no error or anything. I even tried converting the .ISO to .IMG and it still didn't work. Is there something I'm doing wrong? I've checked other forums and none of those seem to help. I'd appreciate any advice.

Solution 1:

Simply copying over the iso to the usb doesn't make it bootable. You need to use an application like pendrivelinux or unetbootin to make a bootable USB.

These tools extract the individual files from the iso and copy them to the USB and then overwrite the bootloader of the usb itself, thus making it bootable.

The above activity will erase all data from your USB drive. backup the data from the usb