brendan.h...@gmail.com wrote on 2/28/19 3:33 PM:
On Thursday, February 28, 2019 at 9:26:31 AM UTC-5, Daniil Travnikov wrote:
On Thursday, February 28, 2019 at 9:04:05 AM UTC-5, unman wrote:
You are trying to write to an iso file, which is a read only file
system. (It's an image of a CD/DVD)

As awokd has suggested, you need to copy the files to a USB drive, or
similar, and edit them there. Then create a new iso image and boot from
that.

In first step: "1. I write .iso via Rufus in DD mode." I already copied this 
files on USB. It means that when I open usb flash drive I see not .iso file, I see files 
and folders which I can't edit because it is not writable.

The file system on the USB stick is still ISO 9660 (not FAT or ext2 or NTFS). 
That file system does not support updates to files.

 From wikipedia:
ISO 9660 is by design a read-only, pre-mastered file system ... all the data has to be 
written in one go or "session" to the medium

In order to update files, you need to extract the tree to a file system that 
supports updating files, then remaster the image, then use that image to DD to 
the USB.

Brendan

Thought I was able to edit them directly on the USB drive in the past. Has that changed, or am I confused?

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