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I updated to a newer version of Ubuntu about a month ago. Since then, I cannot update any software because when the Update Manager asks for my password it says incorrect password. This is not the case because the password works for everything else and I have not changed the password at all.

I tried to change the password from the settings but it wouldn't let me because it said password incorrect again. Any help would be appreciated.


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could you clarify to which Ubuntu version did you update to? –  papukaija Jul 17 '13 at 9:09
do I get that right -- you are able to log in, right? What happens if you open a terminal and type sudo -i? –  January Jul 17 '13 at 9:56
i updated to Ubuntu 12.04 LTS –  user175928 Jul 18 '13 at 6:42
when i open terminal & type "sudo -i" it asked for password , i typed in my password & it said "sorry try again " , the password i typed is definitely correct as i have not changed the password & it worked fine with my previous version of Ubuntu –  user175928 Jul 18 '13 at 6:49
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