[ubuntu] Help to get back network !! Plzzz

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http://ubuntuforums.org – I tried to mount my drive , and after that before unmounting I tried to delete the mounted folder , then start these problems After reboot forcefully 1.Before logging in , pops up a window User's $HOME/.dmrc file being ignored. File should be owned by user and have 644 permission , file should be owned by user not others 2. After showing desktop , another window pops up Failed to apply network settings org.freedesktop.DBUs.Error.spawn.PermissioInvalid: The permission of setuid helper isnt correct You might not be able to connect to bluetooth network via this machine After that I cant login as root or as sudo . And restart option , shutdown all are absent after these , internet cant get accessed Please help me to solve this problem , I browsing thru now Windows(Which I hate):( (Hardware)