absurdlapse wrote: 
> Hello,
> 
> I am trying to install Debian for the first time. I am on a 2020 iMac running 
> macOS Catalina (which btw does not support the bash terminal anymore: uses 
> zsh, so command line fixes might be different for mac than previously 
> conceived). I've encountered an error ('no mountable file systems') when 
> attempting to download Debian's image file on an amd64 architecture.
> 

It's not a DMG. 

You want to save it, not try to mount it.

Then write it with dd or diskutil to a USB stick.

-dsr-

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