ordinary user privileges in ubuntu problem

Recently installed a virtual machine , ubuntu12.04, many ring true ah. Now there is a small problem is not resolved , to say we look . Do almost everything needs root privileges , ordinary users can not create a file , you can not create a folder , you can not delete files, see the cross compiler tool chain ( confirm installation ) . . . . More to go , these things must be the root authority to complete , who gave support a move it
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to ordinary users sudo privileges
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just ask people figured out sudo chown username ~ / *-R
username change your user name , the perfect solution