not able to mount dmg files

[Aryan1100]

I’m not able to install any applications. When I click on a .dmg file, nothing happens.

I also tried mounting the DMG using:

hdiutil attach /Users/aryan/Downloads/st-stm32cubeide_2.1.0_27993_20260219_1630_aarch64.dmg

but the command just gets stuck and doesn’t complete.

Could you please help me troubleshoot this?

 

[Bigwaff]

If your Mac is corporate, your administrator may have very well disabled your ability to mount DMG image files via end point security software.

 

[benholt]

When hdiutil attach hangs rather than errors, it's usually one of two things.

First, a previous mount attempt left a stuck handle. Run `hdiutil info` in Terminal — if you see anything referencing that STM32 DMG (or any other image that shouldn't be there), detach it with `hdiutil detach /dev/diskN` and try again.

Second, Gatekeeper does an online notarization check on third-party installers and it can hang on a slow or filtered network. Try `hdiutil attach -nobrowse -readonly -noverify /Users/aryan/Downloads/st-stm32cubeide_2.1.0_27993_20260219_1630_aarch64.dmg` — noverify skips the checksum step and nobrowse keeps Finder from involving Quick Look.

If it still hangs, in a second Terminal window run `log stream --predicate 'process == "diskimages-helper"'` while you kick off the attach. That'll tell you what it's actually blocked on.