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I am Indian and in small business of adhaar card and I can't open the singed PDF document in adobe reader in Ubuntu 12.04.3 LTS and there is no alternative that open PDF and validate the signature. So anybody tell me what to do and how to ?

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What is the error that you are getting while opening it? Aadhar card ask for a password which is the pincode. – Jay Dec 25 '13 at 5:48
I know it open with pin code, actually it is not opening any PDF file and I am not know any software that is open PDF and validate the signature. – maq Dec 25 '13 at 6:12

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