Cause
Notice how the error message refers to some conflicting dependencies but doesn’t actually list any? After upgrading Magento the .htaccess file in the Magento root directory gets overwritten with a clean copy.
This means that the memory_limit for PHP 7 gets reset back down to “756M”. Having this value set so low causes some Magento tasks to timeout. So, I simply changed this back to “2G” (which is what I did when I originally installed Magento). Then logged back into the backend and the Check Component Dependency passed.
Fix
First open the .htaccess file in the Magento root directory:
nano .htaccess
Use your Arrow or Page Up/Down keys to work your way down the file and find a line containing memory_limit. You’ll actually find 2 instances in the file, one under PHP 5 and one under PHP 7. Just go ahead and change the instance under PHP 7.
Replace 756MB with 2G
To save your changes, press Ctrl + X.
Then you’ll be asked if you want to save your changes. Simply Type Y and then Enter to do so.
Example of file
(Before)
<IfModule mod_php7.c>
############################################
## adjust memory limit
php_value memory_limit 756M
php_value max_execution_time 18000
############################################
(After)
<IfModule mod_php7.c>
############################################
## adjust memory limit
php_value memory_limit 2G
php_value max_execution_time 18000
############################################