rescue mode: df -kh doesn't reflect all mounted file systems

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http://www.linuxquestions.org – I booted my Ubuntu13.04 in rescue mode. I selected and entered as root in shell prompt. Only "/" (root fs) was mounted which rightly reflected in the output of Code: df -kh I mounted my home (/home) partition and it was successfully mounted. I traversed through that partition. But the above command , i.e. Code: df -kh didn't show that. Why? Also it doesn't show up my boot partition when I mount it. (HowTos)