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I have the same problem as this post explains:

USB boot problems

Laptop Model is Toshiba Satellite

The problem is : I created a bootable usb stick using unetbootin (I tried with universal usb creator also) and after selecting try ubuntu before installing I am getting the following error:

cant open /dev/sr0 no medium found

I tried the fix that was suggested in the above post. So before, my grub boot options were:

setparams 'try ubuntu without installing'
set gfxpayload=keep
linux        /casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash --
initrd       /casper/initrd.lz

I modified the above options by selecting the 'e' key in the boot menu to this:

setparams 'try ubuntu without installing'
set gfxpayload=keep
linux        /casper/vmlinuz.efi live-media-path=/casper/ boot=casper quiet splash ignore_uuid acpi=off nomodeset --
initrd       /casper/initrd.lz

acpi=off and nomodeset was added to fix the graphics problem. Even after adding the lve-media-path I am getting the error. Can somebody please help me to fix the problem?

Thanks :)

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