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Problem 1
- magento/module-target-rule-sample-data 100.0.2 requires magento/module-target-rule 100.0.* -> satisfiable by magento/module-target-rule[100.0.2, 100.0.3, 100.0.4, 100.0.5].
- magento/module-target-rule-sample-data 100.0.3 requires magento/module-target-rule 100.0.* -> satisfiable by magento/module-target-rule[100.0.2, 100.0.3, 100.0.4, 100.0.5].
- magento/module-target-rule-sample-data 100.0.4 requires magento/module-target-rule 100.0.* -> satisfiable by magento/module-target-rule[100.0.2, 100.0.3, 100.0.4, 100.0.5].
- magento/module-target-rule-sample-data 100.0.5 requires magento/module-target-rule 100.0.* -> satisfiable by magento/module-target-rule[100.0.2, 100.0.3, 100.0.4, 100.0.5].
- Can only install one of: magento/module-target-rule[100.1.0-rc1, 100.0.2].
- Can only install one of: magento/module-target-rule[100.1.0-rc1, 100.0.3].
- Can only install one of: magento/module-target-rule[100.1.0-rc1, 100.0.4].
- Can only install one of: magento/module-target-rule[100.1.0-rc1, 100.0.5].
- magento/product-enterprise-edition 2.1.0-rc1 requires magento/module-target-rule 100.1.0-rc1 -> satisfiable by magento/module-target-rule[100.1.0-rc1].
- Installation request for magento/product-enterprise-edition 2.1.0-rc1 -> satisfiable by magento/product-enterprise-edition[2.1.0-rc1].
- Installation request for magento/module-target-rule-sample-data 100.0.* -> satisfiable by magento/module-target-rule-sample-data[100.0.2, 100.0.3, 100.0.4, 100.0.5].

From CE 2.0.6 to 2.1-RC1 i get similar error:
Problem 1
- magento/module-wishlist-sample-data 100.0.5 requires magento/module-wishlist 100.0.* -> satisfiable by magento/module-wishlist[100.0.5, 100.0.2, 100.0.3, 100.0.4].
- magento/module-wishlist-sample-data 100.0.2 requires magento/module-wishlist 100.0.* -> satisfiable by magento/module-wishlist[100.0.5, 100.0.2, 100.0.3, 100.0.4].
- magento/module-wishlist-sample-data 100.0.3 requires magento/module-wishlist 100.0.* -> satisfiable by magento/module-wishlist[100.0.5, 100.0.2, 100.0.3, 100.0.4].
- magento/module-wishlist-sample-data 100.0.4 requires magento/module-wishlist 100.0.* -> satisfiable by magento/module-wishlist[100.0.5, 100.0.2, 100.0.3, 100.0.4].
- magento/module-wishlist-sample-data 100.0.5 requires magento/module-wishlist 100.0.* -> satisfiable by magento/module-wishlist[100.0.5, 100.0.2, 100.0.3, 100.0.4].
- Can only install one of: magento/module-wishlist[100.1.0-rc1, 100.0.5].
- Can only install one of: magento/module-wishlist[100.1.0-rc1, 100.0.2].
- Can only install one of: magento/module-wishlist[100.1.0-rc1, 100.0.3].
- Can only install one of: magento/module-wishlist[100.1.0-rc1, 100.0.4].
- Can only install one of: magento/module-wishlist[100.1.0-rc1, 100.0.5].
- magento/product-community-edition 2.1.0-rc1 requires magento/module-wishlist 100.1.0-rc1 -> satisfiable by magento/module-wishlist[100.1.0-rc1].
- Installation request for magento/product-community-edition 2.1.0-rc1 -> satisfiable by magento/product-community-edition[2.1.0-rc1].
- Installation request for magento/module-wishlist-sample-data 100.0.* -> satisfiable by magento/module-wishlist-sample-data[100.0.5, 100.0.2, 100.0.3, 100.0.4].
Recommendation: Try to uninstall sample data first. Sample data for Magento 2.0.6 are restricted to 100.0.* but Magento 2.1.0 needs 100.1.*. Alternatively you can set the dependencies to 100.1.* in your composer.json.
Sample data can cause massive issues with Magento 2.
Sample data for RC1 was not published. This is likely why you see this error.
Thanks @latenzio I set the Sample Data to 100.1.* and it passed the Readiness Check for 2.1.0rc1.
However, while the upgrade appears to have completed, I am now getting an exception report.CRITICAL: exception 'InvalidArgumentException' with message 'Plugin class Magento\Framework\App\Response\XFrameOptPlugin doesn't exist' in /var/www/html/mage22/vendor/magento/framework/Interception/PluginList/PluginList.php:164
For others that might encounter this, my pre-upgrade composer.json now looks like the following for the require section:.
"require": {
"magento/product-enterprise-edition": "2.1.0-rc1",
"composer/composer": "@alpha",
"magento/module-bundle-sample-data": "100.1.*",
"magento/module-theme-sample-data": "100.1.*",
"magento/module-widget-sample-data": "100.1.*",
"magento/module-catalog-sample-data": "100.1.*",
"magento/module-customer-sample-data": "100.1.*",
"magento/module-cms-sample-data": "100.1.*",
"magento/module-tax-sample-data": "100.1.*",
"magento/module-review-sample-data": "100.1.*",
"magento/module-catalog-rule-sample-data": "100.1.*",
"magento/module-sales-rule-sample-data": "100.1.*",
"magento/module-sales-sample-data": "100.1.*",
"magento/module-grouped-product-sample-data": "100.1.*",
"magento/module-downloadable-sample-data": "100.1.*",
"magento/module-msrp-sample-data": "100.1.*",
"magento/module-wishlist-sample-data": "100.1.*",
"magento/module-gift-card-sample-data": "100.1.*",
"magento/module-product-links-sample-data": "100.1.*",
"magento/module-configurable-sample-data": "100.1.*",
"magento/module-customer-balance-sample-data": "100.1.*",
"magento/module-target-rule-sample-data": "100.1.*",
"magento/module-gift-registry-sample-data": "100.1.*",
"magento/module-multiple-wishlist-sample-data": "100.1.*",
"magento/module-swatches-sample-data": "100.1.*",
"magento/sample-data-media": "100.1.*",
"magento/module-offline-shipping-sample-data": "100.1.*"
},
Another update. I ran magento setup:upgrade from the CLI and it went through the motions and now successfully updated. Unsure if it's a bug from the web system upgrade, or not, but this is what I did.
Most helpful comment
Recommendation: Try to uninstall sample data first. Sample data for Magento
2.0.6are restricted to100.0.*but Magento2.1.0needs100.1.*. Alternatively you can set the dependencies to100.1.*in your composer.json.