To add files to an ISO in any Linux distribution, you can terminal with 'xorriso' tool and follow the following steps:

Step 1: Copy the files you want to add to the ISO to temporary directory.
```
mkdir ~/iso_data
cp <path to files> ~/iso_data
```

Step 2: Mount the ISO as loopback device by using the mount command:
```
sudo mount -o loop <location of iso file> /mnt/iso
```

Step 3: Use 'xorriso' tool to add files in iso_data directory to the ISO file.
```
xorriso -as mkisofs -o <new ISO file path/name> -J -R -graft-points / /~/iso_data
```

Step 4: You can now unmount original ISO and remove the temporary directory.
```
sudo unmount /mnt/iso
rmdir ~/iso_data
```
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