Ubuntu ISOs will not mount in El Cap

Just go to the Terminal and use dd(1) to write that .iso onto the USB stick. That is what I did. Here is an article from June of this year that shows how.

Apparently apple made it more simple.

It is now done with Finder instead of Disk Utility.

The easiest way is to right-click on the .iso image and click "Burn Disk Image 'your.iso' to Disc..."

Refer to the following post for screenshots:

http://forums.macrumors.com/threads/where-is-the-burn-option-in-the-new-disk-uti lity.1891792#post-22034111

I also have this issue. Yet I can mount this in Parallels Linux volume with no problem and a Windows 10 PC. The answers to use finder and DD don't answer why they are not supported. Has Apple blocked these types of images?

NoMoreMrBill wrote:

I also have this issue. Yet I can mount this in Parallels Linux volume with no problem and a Windows 10 PC. The answers to use finder and DD don't answer why they are not supported. Has Apple blocked these types of images?

I have no problem mounting an .iso in the Finder. Not sure why you think they are "blocked".

Sorry I didn't explain completely. They show in finder. If I try to use DiskImageMounter, or I burn images to dvd via another PC (i.e. Windows or a virtual PC) and then try to read the dvd I get the same message no matter what Ubuntu image I burn.

Hence the dd(1) command which is what Ubuntu recommends for OS X.

I think what you are seeing is the fact that OSX doesn't read Linux formatting Ext3, Ext4 etc. as far as the DVD goes.

Just to add, OSX can't open images in a format it can't read.

Ok, yeah I'm sure that's the issue. Guess I just forgot it wouldn't read them. Good thing there's ways around Apple not supporting it......

You can still burn them from the Finder or in the Terminal. Not sure why you need to open one.

Hello NoMoreMrBill,

It can be done, but not from a nice user interface.

I was playing around with the gparted Linux live partitioning distro. I had used this to re-arrange the partitions on my Linux VMWare image so it could be easily resized. This ISO is a hybrid and and doesn't mount from the finder. Here are some interesting commands. (All run from root)

hdiutil imageinfo gparted-live-0.25.0-3-i686.iso

Display all kinds of information about the image

hdiutil pmap gparted-live-0.25.0-3-i686.iso

Display the partition map

And here is the good stuff...

hdiutil attach -nobrowse -nomount gparted-live-0.25.0-3-i686.iso

Attach to the image but don't mount anything. It will print out the useable partitions like so:

/dev/disk2 FDisk_partition_scheme

/dev/disk2s2 0xEF

Since this is a hybrid image, the one I want is the first one.

mount -t cd9660 /dev/disk2 /tmp/cd

Where I have created /tmp/cd (as root). Now the full CD is mounted at /tmp/cd

When I'm done, do the following...

hdiutil detach /dev/disk2

"disk2" unmounted.

"disk2" ejected.

This was what I was looking for.... Thanks!

Best answer ever. Actually the only thing that seems to work on El Capitan when you want to mount an Ubuntu ISO.