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Easy and is works:

truncate --size=3000M system.img

mke2fs -t ext4 -L system_rw system_rw.img

sudo mount system_rw.img

sudo cp -R --preserve=all /path_to_the_ronly_system.img_mountpoint/. /system_rw_mountpoint

example for cp: (sudo cp -R --preserve=all /media/user/_/. /media/user/system_rw/)

That's all folks.

Easy and it works:

truncate --size=3000M system.img
mke2fs -t ext4 -L system_rw system_rw.img
sudo mount system_rw.img
sudo cp -R --preserve=all /path_to_the_ronly_system.img_mountpoint/. /system_rw_mountpoint

Example for cp: sudo cp -R --preserve=all /media/user/_/. /media/user/system_rw/

That's all folks.

Easy and is works:

truncate --size=3000M system.img

mke2fs -t ext4 -L system_rw system_rw.img

sudo mount system_rw.img

sudo cp -R --preserve=all /path_to_the_ronly_system.img_mountpoint/. /system_rw_mountpoint

example for cp: (sudo cp -R --preserve=all /media/tahypro87/_/. /media/tahypro87/system_rw/)

That's all folks.

Easy and is works:

truncate --size=3000M system.img

mke2fs -t ext4 -L system_rw system_rw.img

sudo mount system_rw.img

sudo cp -R --preserve=all /path_to_the_ronly_system.img_mountpoint/. /system_rw_mountpoint

example for cp: (sudo cp -R --preserve=all /media/user/_/. /media/user/system_rw/)

That's all folks.

Easy and is works:

truncate --size=3000M system.img

mke2fs -t ext4 -L / system_rw.img

sudo mount system_rw.img

sudo cp -R --preserve=all /path_to_the_ronly_system.img_mountpoint/. /system_rw_mountpoint

Easy and is works:

truncate --size=3000M system.img

mke2fs -t ext4 -L system_rw system_rw.img

sudo mount system_rw.img

sudo cp -R --preserve=all /path_to_the_ronly_system.img_mountpoint/. /system_rw_mountpoint

example for cp: (sudo cp -R --preserve=all /media/tahypro87/_/. /media/tahypro87/system_rw/)

That's all folks.