WordPress Plugin update "Could not create directory"

Today I update my WordPress to 4.3 version. After that, a few of my plugins requires me to update them. Unfortunately, I got error message like below:

http://downloads.wordpress.org/plugin/plugin-1.0.1.zip…
Unpacking the update…
Could not create directory. /wp-content/upgrade/plugin.tmp
Return to Plugins page

FYI, I run my WordPress blog on cloud server from DigitalOcean. So I have SSH access to run command through console. If you have SSH access too, you can follow my step by step solution.

Honestly, before i figure out this solution, it’s very frustrated. No clue when I Google it. But, finally it can be solved.

First, you have to give access for webserver to access the WordPress installation directory. My WordPress installation is /var/www/wordpress and it might be different with yours, so you need to match it.

Run this command via SSH console/terminal:

chown -R www-data:www-data /var/www/wordpress

after that, you need to set directory permissions as follow:

sudo find /var/www/wordpress/ -type d -exec chmod 755 {} \;
sudo find /var/www/wordpress/ -type f -exec chmod 644 {} \;

Congratulations! Now you can update your plugins or even update your WordPress core.