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This question already has an answer here:

I am unable to login to my primary account. After I input the password, it loads for a while and then again I see the splash screen asking me to input my password again.

Sometimes it shows mountall and disconnected Plymouth or something like that.

I changed my root password but still I cant access it from my Guest account.

How do I solve these problems?

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marked as duplicate by guntbert, Aditya, karel, Warren Hill, Eric Carvalho Nov 24 '13 at 3:56

This question was marked as an exact duplicate of an existing question.

Delete .Xautority file on your home folder:

sudo rm /home/yourusername/.Xautority

And try to log in again.

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But sudo doesnot work on the Guest account. – Manjil P. Saikia Nov 21 '13 at 14:51
I did that, still does not work. Please help. – Manjil P. Saikia Nov 21 '13 at 14:58

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