How to solve the phpmyadmin not found issue after upgrading php and apache?

Create a link in /var/www like this:

sudo ln -s /usr/share/phpmyadmin /var/www/

Note: since 14.04 you may want to use /var/www/html/ instead of /var/www/

If that's not working for you, you need to include PHPMyAdmin inside apache configuration.

Open apache.conf using your favorite editor, mine is vim :)

sudo vim /etc/apache2/apache2.conf

Then add the following line:

Include /etc/phpmyadmin/apache.conf

For Ubuntu 15.04 and 16.04

• sudo ln -s /etc/phpmyadmin/apache.conf /etc/apache2/conf-available/phpmyadmin.conf
• sudo a2enconf phpmyadmin.conf
• sudo service apache2 reload

Usually this is an issue after a vanilla install in 16.04, 18.04 and 20.04 (Focal Fossa) and higher too.

To fix it:

sudo ln -s /etc/phpmyadmin/apache.conf /etc/apache2/conf-available/phpmyadmin.conf
sudo a2enconf phpmyadmin.conf
sudo systemctl restart apache2

Most probably your apache doesn't load the configuration of the phpmyadmin part.

The link you made from /etc/phpmyadmin/apache.conf to /etc/apache2/conf.d/phpmyadmin.conf may not be valid anymore after the update. Make this link again, but notice the names may be different. After that, restart apache.