How to convert dmg(mac) to iso(ubuntu)?

Question

macOS

2 ways:
1.iat

sudo apt install iat
iat file.img file.iso

stops at

iat "macOS_Catalina_10.15.2_19C57.dmg" "macOS_Catalina_10.15.2_19C57.iso"
Iso9660 Analyzer Tool v0.1.3 by Salvatore Santagati
Licensed under GPL v2 or later

and it does not plow further ...
if you look at link
2. according to the article
dmg2img /home/dan/desktop/image.dmg /home/dan/desktop/image.img
mkdir /media/image
sudo modprobe hfsplus
sudo mount -t hfsplus -o loop image.img /media/image
CONVERT THE .IMG TO .ISO
I open brasero, select the data disk, select the folder made with the mount-/media/image This window pops
up: I

click "always add files" I start the
virtual machine:
and no way .
since in fact there is no "boot.efi" ...
and this window pops up:

it's so insulting, in fact I need xcode
images downloaded from the rutracker with dmg to iso conversion, all the same.
Once it turned out 10.13, but xcode is not installed ... (it is installed from version 10.14.4) (boot.efi was there)
Xcode is needed for the iphone emulator.
Help people, where to poke, I really need an iphone emulator with keyboard. (f12 chrom does not fit, there is no keyboard)
PS: there is no money for Windows and poppy.

Answer 1

It's not just converting.
Check out the notorious Proxmox installation article for some helpful thoughts. Verified,
https://www.nicksherlock.com/2018/06/installing-ma...