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I've done the following several times, but now it doesn't work anymore:

  1. downloaded the latest Raspbian image
  2. qemu-img resize 2017-06-21-raspbian-jessie-lite.img +300M
  3. sudo losetup -P /dev/loop0 2017-06-21-raspbian-jessie-lite.img
  4. sudo gparted /dev/loop0
  5. using gparted, resized the fs partition to fill the empty space
  6. sudo losetup -D
  7. truncate --size=$[(3162111+1)*512] 2017-06-21-raspbian-jessie-lite.img

The "magic number" 3162111 is the last sector of the second partition. Then I burned an sd-card with the new image. It doesn't boot - it hangs on the 4 raspberries with black screen.

Of course the original one works fine. I've noticed that sudo losetup -a still shows the image mounted:

$ sudo losetup -a
/dev/loop0: [2049]:1179664 (/home/dev/opt/2017-06-21-raspbian-jessie-lite.img), offset 48234496

Trying again with sudo losetup -D doesn't change anything. Even fuser -c or -k does nothing useful.

I'm afraid the problem on boot is related to this. What could I try to check now?

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