bin/magento setup:upgrade fail with magento 2.0.6 to 2.1.0-RC1

[quienti]

Steps to reproduce

1. composer require magento/product-community-edition 2.1.0-rc1 --no-update
2. composer update
3. bin/magento setup:upgrade

Expected result

1. Upgrade work fine

Actual result

1. SQL Duplicate error
   

[mazhalai]

@quienti I am confused about your steps and title, did you mean composer require magento/product-community-edition 2.1.0-rc1 --no-update instead? Also, did you have sample data?

[quienti]

Oops, sorry !
Bad copy / paste

I have upgrade Magento 2.0.6 to 2.1.0 RC1
After update, when I use bin/magento setup:upgrade, I have this error

[mazhalai]

Haven't been able to reproduce this error. Also, cannot figure out where 4-Images is coming from. Do you have sample data or some other 3rd party modules?

[quienti]

I have a lot of customs modules, but any work with eav_attribut_group
I did not found 4-Images in my database too

I succeed to upgrade after commenting this
https://github.com/magento/magento2/blob/develop/app/code/Magento/Catalog/Setup/UpgradeData.php#L241-247

But not really a solution

[quienti]

Close because this is not a Magento bug apparently