[ubuntu] No access to home folder after chown

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http://ubuntuforums.org – Hello, I've done a fresh install of 12.04 after having 10.04 for a while. I've copied some files of the old home folder to an external hdd and pasted it afterwards in the new home folder. I got problems with permissions. I saw on the internet that I had do this with my own username: sudo chown -R username:username /home/username After this I wasn't able to open the home folder anymore, something with 'it is no map' or something (forgot it). After reboot I couldn't login to my home folder. At Guest account now..who can help me? Thanks in advance. (Hardware)