The screenshot in the bug report shows you going from version 1.9.7 to 16.04dev and it's complaining about trying to install 'socialprofile' plugin because it's already installed. But the thing is 'socialprofile' plugin doesn't exist in in 1.9.7, so I'm thinking the mysql database you used may not have been clean.
Can you please test again with a fresh mysql database.
Replying to #2
The screenshot in the bug report shows you going from version 1.9.7 to 16.04dev and it's complaining about trying to install 'socialprofile' plugin because it's already installed. But the thing is 'socialprofile' plugin doesn't exist in in 1.9.7, so I'm thinking the mysql database you used may not have been clean.
Can you please test again with a fresh mysql database.