$ sudo apt-get remove dmg2img 

Uninstall dmg2img including dependent package

If you would like to remove dmg2img and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove dmg2img 

Use Purging dmg2img

If you use with purge options to dmg2img package all the configuration and dependent packages will be removed.

$ sudo apt-get purge dmg2img 

If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.

$ sudo apt-get purge --auto-remove dmg2img 

See Also,