DiskImageMounter not working

Question

Level 1

4 points

DiskImageMounter not working

I have OS X El Capitan 10.11.6 installed on my MacBook Air.

I'm not able to mount any files with DMG-extension. That means I'm not able to install most of the applications outside of Apple Store. I've tried manually make the DMG-extension files to use DiskImageMounter to mount them, once the file name is double clicked. Doesn't work.

- If I just double click the DMG-extension file, I get the response that there isn't any program set to open the file.

- If ask the OS X to open the file with DiskImageMounter, I get the response, that the item (DiskImageMounter) is damaged locked or in a folder that you don't have permission to change. (error -9499).

- If I try to run only the DiskImageMounter straight by double clicking it's name, I get the response that the program can not be opened, because it is damaged or incomplete.

I have had this situation with the system for a while, and got several updates to the operating system since the problem began. None of the updates how ever have fixed it. What could I do get the DMG-files opened and the programs within installed?

Thanks already in advance for your help!

MacBook Air, OS X El Capitan (10.11.6), null

Posted on Jul 25, 2016 2:22 AM

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Answer 1

Jan 25, 2017 3:15 AM in response to descida

Hi,

Not being very savvy, can I ask you, you created a new user with admin permissions, do you mean 'log out of **' and then create a whole new user?? Doesn't that user login also go with all your files, etc?

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Answer 2

Jul 25, 2016 2:51 AM in response to descida

Thank you for you help

เมื่อ 25 ก.ค. 2559 เวลา 16:22 เขียนโดย Apple Support Communities Updates <discussions-updates@apple.com>:

Apple Support Communities

descida <https://discussions.apple.com/profile/descida?ac_cid=tw123456> has posted in the OS X El Capitan community.

DiskImageMounter not working <https://discussions.apple.com/thread/7620348?ac_cid=tw123456#30458270>

I have OSX El Capitan 10.11.6 installed on my MacBook Air.

I'm not able to unmount any files with DMG-extension. That means I'm not able to install most of the applications outside of Apple Store. I've tried manual make the DMG-extension files to use DiskImageMounter to unmount them selves once the file name is double clicked with mouse. Doesn't work.

- If I just double click the DMG-extension file, I get the response that there isn't any program set to open the file.

- If ask the OSX to open the file with DiskImageMounter, I get the response, that the item is damaged locked or in a folder that you don't have permission to change. (error -9499).

- If I try to run only the DiskImageMounter straight by double clicking it's name, I get the response that the program can not be opened, because it is damaged or incomplete.

I have had this situation with the system for a while, and got several updates to the operating system of the problem began. None of the updates how ever have fixed it. What could I do get the DMG-files opened and the programs within installed?

Thanks already in advance for your help!

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Answer 3

descida Author

Level 1

4 points

Jul 25, 2016 3:28 AM in response to yup's iMac

The permissions for the DiskImageMounter are:

drwxr-xr-x 3 root wheel

102 31 Tou 08:14 DiskImageMounter.app

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Answer 4

descida Author

Level 1

4 points

Jul 25, 2016 3:56 AM in response to descida

As an extra information, in ~/Library/Preferences this file does not exist (not sure if it supposed to exist in El Capitan):

com.apple.LaunchServices.plist

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Answer 5

dialabrain

Level 10

137,603 points

Jul 25, 2016 5:17 AM in response to descida

Try downloading and running the combo update…

Download OS X El Capitan 10.11.6 Combo Update

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Answer 6

descida Author

Level 1

4 points

Jul 25, 2016 5:29 AM in response to dialabrain

Thanks for the tip, but the problem is, that the combo update is also a DMG-file, so I can't open it or install it.. Any ideas?

I also already tried now to reinstall El Capitano version 10.11.5 by restarting and pressing CMD+R, but that didn't solve the problem althought the reinstall successful. Still, no software is assigned to open DMG-files, and I'm not able to assign DiskImageMounter to open them either. (error -9499).

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Answer 7

Esquared

Level 6

12,425 points

Jul 25, 2016 5:33 AM in response to descida

You might be able to circumvent this by mounting the Disk Image from the Terminal:

http://osxdaily.com/2011/12/17/mount-a-dmg-from-the-command-line-in-mac-os-x/

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Answer 8

dialabrain

Level 10

137,603 points

Jul 25, 2016 5:36 AM in response to descida

Sorry, I wasn't thinking. no coffee yet. 😕

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Answer 9

descida Author

Level 1

4 points

Jul 25, 2016 11:14 AM in response to Esquared

"You might be able to circumvent this by mounting the Disk Image from the Terminal:

http://osxdaily.com/2011/12/17/mount-a-dmg-from-the-command-line-in-mac-os-x/"

I tried that too, and managed to mount it with the terminal. How ever, once mounted there was a .pkg type of file inside. Couldn't proceed from there on. Thanks anyway.

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Answer 10

dialabrain

Level 10

137,603 points

Jul 25, 2016 11:17 AM in response to descida

What was the .dmg supposed to be? Some apps come as .pkg files and you run them by double clicking on them. Assuming you know what it is.

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Answer 11

descida Author

Level 1

4 points

Jul 25, 2016 11:24 AM in response to descida

Finally, I managed to crack this one. I think the origin of the error might be from installing Homebrew of Xcode, or some software with some Terminal work included. Anyway, the problem was this:

- Programs within ~/System are protected and the rights can not be changed (as far as I know). I tried it, but the answer was always, that I don't have enough rights to do it. Couldn't find any good Terminal script for it either. The DiskImageMounter is located deep within the system structure ~/System/Library/CoreServices/. I did even a reinstallation of the operating system (not a clean install). I downgraded from 10.11.6 to 10.11.5. This didn't have any impact to my problem. As I was just about to make a complete clean install and had already created a memory stick with El Capitan within, I decided to give a try to one very simple test and that was the final solution.

Solution:

I created a new account with administrator permissions. That worked, the new account extracted DMG-files without any problems at all. So if you end up with problems with rights deep inside the system folders, this might the solution for you too. 🙂🙂🙂

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Answer 12

descida Author

Level 1

4 points

Jul 25, 2016 11:32 AM in response to dialabrain

The .dmg file held inside a .pkg file. There was no program set to open either one of those file types, and I wasn't able to assign any program to open them up either. So as I clicked the .pkg, the operating system asked what program would I like to use to open it. There was no luck trying different programs on that one, including the DiskImageMounter. But I managed to solve the problem: created a new user for me with administrator permissions and deleted the old user.

Thanks for your help!

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Answer 13

dialabrain

Level 10

137,603 points

Jul 25, 2016 11:48 AM in response to descida

You're welcome. I suppose whatever was causing diskimagemounter not to work prevented the pkg from opening. I install pkgs fairly often.

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