Ubuntu user asking password again and again and given password is not working

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Solution- move to terminal mode (CTRL+ALT+f1, CTRL+ALT+F4) 

login with the user then

sudo chmod -R u+w /home/user

cd /home/user

sudo rm -rf .Xauthority .ICEauthority

Move out from this terminal window (Login into Graphics mode CTRL+ALT+F7)


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