Unique and Unsolvable HTTP Error

Like many others, I’ve been running to the HTTP error when attempting to upload media. The file loads to 100% then gives me the red “HTTP Error”. I have looked up many solutions, including the famous thread showing 8-9 solutions. I’ve tried them all and none of them worked for me. I host wordpress on my own VPS through DigitalOcean. I’ve edited the .htaccess file with particular snippets of code. I’ve changed the max upload and all of that. I’ve reinstalled the base wordpress installation. I’ve tried everything.

The error only arises when I try to upload pictures with very high resolution. The file size seems irrelevant. Another thing that I have noticed is that the “maximum upload file size” in the media page does not match my php.ini files. These are the files I edited:

/etc/php5/apache2/php.ini
/etc/php5/cli/php.ini
/var/www/mysite/wp-admin/php.ini
/var/www/mysite/php.ini
/var/www/mysite/wp-content/themes/mytheme/functions.php
-in this last case, I added @ini_set( ‘upload_max_size’ , ‘150M’ ), etc;

I set all of the variables equal in all of these files, and yet it does not change the “maximum upload file size” message in the media page. It remains unchanged at 89M regardless of how I edit my php.ini files.

This problem is a bit frustrating. Whenever I have an error on wordpress, the forums almost always clear things up. Or I can use my own knowledge to solve it. In this case, nothing I do has any affect on my problem whatsoever. Has anyone else had a problem with this? I would appreciate any help. Thanks.