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Above all please make a directory under /mnt (I called the directory "MyMount1"); "mylogin" represents your login name. Open the terminal and type the next commands:
-sudo mkdir /mnt/MyMount1
-sudo chown mylogin:mylogin /mnt/MyMount1
-copy system.img & paste it into MyMount1 (computer/mnt/MyMount1).
-cd /
-cd mnt
-cd MyMount1
-mkdir sys/ && sudo mount -t ext4 -o loop system.img sys/
-sudo chown mylogin:mylogin sys (without this command you will not be able to copy and modify anything).
-cd sys
-sudo chown mylogin:mylogin addon.d (without this command you will not be able to copy and modify anything).
-then copy addon.d & paste it into Ubuntu Desktop (now you can make any changes you want).
-then delete addon.d (into /mnt/MyMount1/sys).
-copy addon.d (into Ubuntu Desktop) & paste it into /mnt/MyMount1/sys
-then apply the same command to every folder inside system.img (/mnt/MyMount1/sys) and repeat the procedure (copy it into Ubuntu Desktop, make changes and paste it into /mnt/MyMount1/sys).
The following screenshot will help you better understand all the steps :



Before "sudo chown mylogin:mylogin sys" command :



After "sudo chown mylogin:mylogin sys" command :



Before "sudo chown mylogin:mylogin addon.d" command :



After "sudo chown mylogin:mylogin addon.d" command :



That's all ... for now

Awesome. Thanks for your work Cleo.

UPDATE :

NEW sudo chown terminal command. For further details please visit the next thread :

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