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On a Mac, I followed the steps for the 'USB download from Mac', but on Step 9: Execute

sudo dd if=/path/to/downloaded.img of=/dev/diskN bs=1m

(replace /path/to/downloaded.img with the path where the image file is located; for example, ./ubuntu.img or ./ubuntu.dmg).

When I replace /path/to/downloaded.img with the ubuntu.img file (I converted the iso file into a img.dmg file, then to a img file) and press Enter, the Terminal just comes up with:

ubuntu.img;file or directory not found.

Any reasons why this might be happening?

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Make sure your path is correct. Declaring only ubuntu.img works only if you are in the folder where that file is saved. Otherwise you have to specify to absolute (full) path to the file. – André Stannek Nov 1 '12 at 17:00

If you are trying to create a boot-able Live Ubuntu USB installer then i suggest you try this software : UNetBootIn software :

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