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I have a cubieboard (similar to Raspberry Pi). I wanted to clone the 2GB micro sd card to a 8Gb card.

Commands issued:

umount (all partitions on sd)
dd if=/dev/sdb of=/root/image.img
change sd card
dd if=/root/image.img of=/dev/sdb 

then in gparted I resized the data partition.

But the system did not boot. I have no log files nor monitor output.

Question: Are the dd commands correct? is it /dev/sdb and not /dev/sdb1? This would be the one partition only.

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dd commands are correct, if the system doesn't boot I would guess that you need to restore grub (if it's linux), that is if you are sure that the /dev/sdb contains whole system. Try using BootRepair

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