OS: Ubuntu 9.10 - Karmic Koala (GNU/Linux) 

Browser: Google  Chrome 5.0.342.9 beta  

How fix chrome bug:

"Your profile could not be opended correctly. Some features may be unavailable. Please check that the profile exists and that you have permission to read and write its contents"

Step by step:

1 - Close Google-Chrome

2 - Rename default chrome user profile: open a shell and run:  mv ~/.config/google-chrome in ~/.config/google-chrome-old

3 - Launch Google-Chrome

4 - Close Google-Chrome

5 - After the execution you will find  a new and clean user profile  ~/.config/google-chrome

    In a shell execute: cp -r  ~/.config/google-chrome-old/Default in ~/.config/google-chrome/