How to extract/mount Nero images (nrg)

You can convert it to iso via nrg2iso

sudo apt-get install nrg2iso
nrg2iso source.nrg desitination.iso

or you can try nero for linux

One solution is to convert NRG to ISO using nrg2iso program. Another solution is to mount NRG using acetoneiso2. Both programs are present in repositories.

Furius ISO Mount could mount or burn .nrg Images

It is in the Software Center