самое простое:
sudo mount /where/image.iso /mnt/cdrom -o loop -t iso9660
Если вдруг скачаешь образ, который немного не iso, то вот тебе в помощь:
eix 2iso
* app-cdr/bin2iso
Available versions: 19b-r2
Homepage: http://users.andara.com/~doiron/bin2iso/
Description: converts RAW format (.bin/.cue) files to ISO/WAV format
* app-cdr/ccd2iso
Available versions: 0.3
Homepage: http://sourceforge.net/projects/ccd2iso/
Description: Converts CloneCD images (popular under Windows) to ISOs
* app-cdr/mdf2iso
Available versions: 0.3.0-r1
Homepage: http://mdf2iso.berlios.de/
Description: Alcohol 120% bin image to ISO image file converter
sanja@amigo:~$ apt-cache search iso|grep -i image && lsb_release -ds
genisoimage - Creates ISO-9660 CD-ROM filesystem images
b5i2iso - BlindWrite image to ISO image file converter
bchunk - CD image format conversion from bin/cue to iso/cdr
ccd2iso - Converter from CloneCD disc image format to standard ISO
cdi2iso - DiscJuggler image to ISO image file converter
dfsbuild - Build Debian From Scratch CD/DVD images
furiusisomount - An ISO, IMG, BIN, MDF and NRG image management utility
fuseiso - FUSE module to mount ISO filesystem images
gisomount - A utility for mounting and managing .iso images
gmountiso - This is Gmountiso, a PyGTK GUI to mount your cd images
iat - Converts many CD-ROM image formats to iso9660
isomaster - A graphical CD image editor
jigdo-file - Download Debian CD images from any Debian mirror
kiso - program to create manipulate and extract CD Image
libisofs6 - library to create ISO9960 images
mdf2iso - A simple utility to convert mdf to iso / cue / toc images
pdi2iso - Instant Copy image to ISO image file converter
perceptualdiff - perceptual image comparison tool
virtualbox-guest-additions - guest additions iso image for VirtualBox
grub-rescue-pc - GRUB bootable rescue images, version 2 (PC/BIOS version)
Ubuntu 9.10