When I instal nextgen-gallery plugins. This error message appears
Downloading update from https://downloads.wordpress.org/plugin/nextgen-gallery.zip… Unpacking the update… Could not create directory.
How can I fix this problem ?
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Answer
This is a permissions issue. Ensure the directory is writable by apache. Plugins are unpacked into the wp-content/plugins directory, so I would first attempt writing to the directory as apache:
sudo -u apache touch /path/to/wp-content/plugins/test.txt
Set permissions accordingly to correct the issue. You can read about permissions here: https://www.pluralsight.com/blog/it-ops/linux-file-permissions
You can read about the correct file permission scheme for WordPress here: https://wordpress.org/support/article/changing-file-permissions/