Convert .dmg files to .iso files how to so on ubuntu

when it creates an ISO image what will it be burnable in on ubuntu?

Please follow these instructions:

https://help.ubuntu.com/community/ManageDiscImages#DMG_Images

dmg2img /path/to/example.dmg /path/to/example.img

where do I find the file name to enter

I have the cd in the computer but cant seem to find any relevant data to enter in the example spot

but the cd shows up as a dvd icon which says boot camp and ive search all through it

Im having a hard time locating the file in ubuntu home folder or anywhere in ubuntu

Please send us the output of the following command:

 sudo find / -name *.dmg ; mount; df -h

/dev/sda1 on / type ext4 (rw,errors=remount-ro,commit=0)
proc on /proc type proc (rw,noexec,nosuid,nodev)
none on /sys type sysfs (rw,noexec,nosuid,nodev)
fusectl on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
none on /dev type devtmpfs (rw,mode=0755)
none on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /dev/shm type tmpfs (rw)
none on /var/run type tmpfs (rw,nosuid,mode=0755)
none on /var/lock type tmpfs (rw,noexec,nosuid,nodev)
/dev/loop0 on /var/spool/havp type ext3 (rw,mand,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=0,commit=0)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
gvfs-fuse-daemon on /home/nate/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=nate)
/dev/sr0 on /media/Boot Camp type iso9660 (ro,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000,iocharset=utf8,mode=0400,dmode=0500)
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 291G 18G 259G 7% /
none 1.5G 696K 1.5G 1% /dev
tmpfs 1.5G 1.5M 1.5G 1% /dev/shm
none 1.5G 304K 1.5G 1% /var/run
none 1.5G 4.0K 1.5G 1% /var/lock
/dev/loop0 97M 5.6M 87M 7% /var/spool/havp
/dev/sr0 790M 790M 0 100% /media/Boot Camp

What are the contents of that Mac CD? If it is 'Boot Camp' your system seems to be able to use it already without conversion (see the line "/dev/sr0 790M 790M 0 100% /media/Boot Camp" in the df -h output above).

Open Nautilus and look in /media - what do you see there?

when in home folder i go to file system and locate the file media

the file boot camp is there with a cd on a file logo

and when I click it I get the same stuff when I put the cd in and click it

so I get several files

If I do not misinterpret your response "so I get several files", you are already able to access the files on the CD without any DMG-to-ISO conversion.

What do you want to achieve?
- create a copy of the CD?
- Run the Mac program on your Ubuntu system?
- access pictures, videos that are stored on the CD?
- ...?

im trying to install in a virtual box

but cant because it is a DMG file

i have to convert to ISO in order to install in virtual box

when I try to boot within virtualbox I cant find the proper file

when I type the command codedmg2img /path/to/bootcamp.dmg /path/to/bootcamp.img

 this is what I get
dmg2img v1.6.2 is derived from dmg2iso by vu1tur (<email address hidden>)

what does it mean

According to http://en.wikipedia.org/wiki/Apple_Disk_Image DMG is a format used by Apple for storing CD disk images on hard disk.

From all your information above I can only read that you have a Mac CD, but you nowhere provided the proof that you do really have a DMG file.

And the line "/dev/sr0 on /media/Boot Camp type iso9660" of the mount command indicates that the CD is iso9660 format and can be read on your system.

So the question seems more to be - why can't your virtualbox not read the CD?
Are there any error messages from your virtualbox commands?