Reset Opera master password

1) Close Opera.

2) If "Tools ---> Pref. ---> Advanced ---> Security ---> Use master password to protect" is not ticked, then delete opcert6.dat from the following folder :
    "C:\Users\YOUR_USER_NAME\AppData\Roaming\Opera\Opera"
    or 
    in Address bar of explorer, paste this 
    %appdata%\Opera\Opera

If "Use master password to protect" is ticked, then delete opcert6.dat & wand.dat from the path.

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How to open android SDK manager through terminal.

go to the sdk-directory/tools and run sdk manager by typing "./android". 
>cd android-sdks
>cd tools
>./android

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Working with Android (Question and Answer)

Question :

How to fix “unknown filesystem type 'exfat'” issue in ubuntu

answer:

execute this command sudo apt-get install exfat-fuse exfat-utils

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