The next Ubuntu img converted to iso following two commands:
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ccd2iso nrg2iso
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Installation is very simple:
sudo apt-get install ccd2iso nrg2iso
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Usage is as follows:
Usage: ccd2iso <.img filename> <.iso filename>
ccd2iso option: -? -h --help show this help
-v --version show version number
Usage : nrg2iso image.nrg image.iso
--version display version number
--help display this notice
Reproduced in: https: //my.oschina.net/dake/blog/196733