windows 7 - Bypass read-only SD card with missing 'Lock' slider

I have an SD card, that is broken, the slider for the "Lock" is gone. When I put it into my computer it turned out to be in read-only, How can I override this with software? I need to format the SD card. I am using Ubuntu and Windows 7

Answer

From sd card reader not working :

I found that unlocked, my Eye-Fi card should only be inserted 20-22mm
into the card reader (not all the way). Locked, it seemed to work
fine inserted all the way.

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Another solution from Repair missing SD-card lock :

1. Get a piece of aluminum foil and stick it onto a piece of tape then put it on SD :
   




2. Cut a straw into pieces that can fit into the hole of the Lock
   and fill the hole with them
   and cover with the other end of a scotch-tape. Use 2-3 pieces of straw :
   




3. Insert into the card-reader :