gistfile1.txt

1. Create a file at the webroot called whoami.php
2. Put this code in the whoami.php file and save it:  
    <?php echo `whoami`; ?>
3. Access whoami.php via the browswer to see who the user is that your web server runs as.
4. In the console, type this where {user} is the user from the whoami.php:  
     groups {user}
5. Observe the groups that the user belongs to.  Usually it's just one.  Usually it's "www-data"
6. cd to your WordPress directory
7. Run this command, change {user} to the user shown on the whoami.php page and {group} to the group from step 5 that looks like your server's group:  
    chown -R {user}:{group} wp-content
8. Run this command:  
    chmod -R ug+rw wp-content