DMG Automounter is a Nautilus script that enables any distribution of Linux (with the GNOME desktop) to mount a Mac OS X .dmg file (but not install it, since that would require the Mac OS X APIs which are closed source).

1. In order for both scripts to properly run, the folder, dmg2img, must be in your home folder. However, if you do decide to change the location of dmg2img, then write it in the script, dmgmount. Also, both scripts, dmgmount and dmgunmount, must be located in /home/(your username)/.gnome2/nautilus-scripts in for them to run. If you like GUI, then access your home folder, press Ctrl-H, and scroll down to the folder, .gnome2. Afterwards, drag and drop both scripts in the nautilus scripts folder. On the other hand, if you prefer the command line, then run, cp /path/to/script ~./gnome2/nautilus-scripts. Then, whether or not you prefer GUI or the command-line, open terminal and run, sudo chmod a+x ~./gnome2/nautilus-scripts/*

2. Next, to mount the dmg, right-click on the dmg file and select the section titled "Scripts" and choose dmgmount. After you are finished and you want to unmount the dmg, be sure to NOT automatically unmount them. Instead, right-click on the original dmg file and select "Scripts" again and choose dmgunmount.