I have downloaded the Ubuntu 14.04 ISO through Firefox, do I have to save it to a disk? Or how do I get it to just run? I have changed the repositories to [...]old-release[...]
but I still can't get any update. When I run /etc/apt/sources.list
I get a permission denied error.
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kos
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As Gregory pointed out, use either Unetbootin or Universal USB Installer to create a live bootable USB drive. Then if you boot from this USB and select install,it will ask you whether to upgrade to 14.04 ( if indeed you are running versions < 14.04).

Ron
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Universal USB Installer is the one to use in Windows 8 because UNetbootin doesn't support Windows 8 and Windows 10. – karel Apr 26 '15 at 16:07
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Really! I didn't know that. Thanks. – Ron Apr 26 '15 at 16:09
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I personally use Unetbootin and create a bootable USB drive to install my distros, And it gives me the ability to try it out and make sure everything works before I install.