If you reiceive the following error while starting phpmyadmin in your browser:
This page isn’t working Example.com is currently unable to handle this request. HTTP ERROR 500
Most probably you have a conflict with your PHP version after upgrading to Ubuntu 20.04. If you have different PHP Versions installed, you need to tell phpmyadmin which Version to use.
Open with your editor:
sudo nano /etc/apache2/conf-available/phpmyyadmin.com
and add the following lines after the alias Tag
<FilesMatch \.php> # Apache 2.4.10+ can proxy to unix socket SetHandler "proxy:unix:/var/run/php/php7.4-fpm.sock|fcgi://localhost/" </FilesMatch>
sudo service apache2 restart
Now open you phpmyadmin page again.