PHP errors Class Locale and DOMImplementation not found after Icingaweb 2 upgrade

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After Icingaweb 2 was upgraded from 2.8.2 to 2.9.3 on an Ubuntu 20.04 machine, the user interface would not show up anymore. Instead a big PHP error was displayed:

Fatal error: Uncaught Error: Class 'Locale' not found in /usr/share/icinga-php/ipl/vendor/ipl/i18n/src/Locale.php:122 Stack trace: #0 /usr/share/icinga-php/ipl/vendor/ipl/i18n/src/Locale.php(87): ipl\I18n\Locale->parseLocale() #1 /usr/share/php/Icinga/Application/Web.php(514): ipl\I18n\Locale->getPreferred() #2 /usr/share/php/Icinga/Application/ApplicationBootstrap.php(730): Icinga\Application\Web->detectLocale() #3 /usr/share/php/Icinga/Application/Web.php(105): Icinga\Application\ApplicationBootstrap->setupInternationalization() #4 /usr/share/php/Icinga/Application/ApplicationBootstrap.php(416): Icinga\Application\Web->bootstrap() #5 /usr/share/php/Icinga/Application/webrouter.php(107): Icinga\Application\ApplicationBootstrap::start() #6 /usr/share/icingaweb2/public/index.php(4): require_once('/usr/share/php/...') #7 {main} thrown in /usr/share/icinga-php/ipl/vendor/ipl/i18n/src/Locale.php on line 122

By looking at the error message more closely, you can spot the i18n keyword in the stack trace path. This is short for internationalization (same way K8s is short for Kubernetes). Is this PHP package installed? Let's check:

root@icingaweb:~# dpkg -l|grep php7.4
ii  libapache2-mod-php7.4                7.4.3-4ubuntu2.6                         amd64        server-side, HTML-embedded scripting language (Apache 2 module)
ii  php7.4                               7.4.3-4ubuntu2.6                         all          server-side, HTML-embedded scripting language (metapackage)
ii  php7.4-cli                           7.4.3-4ubuntu2.6                         amd64        command-line interpreter for the PHP scripting language
ii  php7.4-common                        7.4.3-4ubuntu2.6                         amd64        documentation, examples and common module for PHP
ii  php7.4-curl                          7.4.3-4ubuntu2.6                         amd64        CURL module for PHP
ii  php7.4-fpm                           7.4.3-4ubuntu2.6                         amd64        server-side, HTML-embedded scripting language (FPM-CGI binary)
ii  php7.4-json                          7.4.3-4ubuntu2.6                         amd64        JSON module for PHP
ii  php7.4-ldap                          7.4.3-4ubuntu2.6                         amd64        LDAP module for PHP
ii  php7.4-mbstring                      7.4.3-4ubuntu2.6                         amd64        MBSTRING module for PHP
ii  php7.4-mysql                         7.4.3-4ubuntu2.6                         amd64        MySQL module for PHP
ii  php7.4-opcache                       7.4.3-4ubuntu2.6                         amd64        Zend OpCache module for PHP
ii  php7.4-readline                      7.4.3-4ubuntu2.6                         amd64        readline module for PHP
ii  php7.4-soap                          7.4.3-4ubuntu2.6                         amd64        SOAP module for PHP

Nope, the php7.4-intl package is missing. Let's install that:

root@icingaweb:~# apt-get install php7.4-intl

Followed by a restart of PHP-FPM.
Note: If your Icingaweb2 installation is using PHP as Apache module mod_php, restart Apache2 instead.

root@icingaweb:~# systemctl restart php7.4-fpm

Now the user interface showed up again, but the Dashboard showed yet another PHP error:

This time another class "DOMImplementation" was not found:

Fatal error:  Uncaught Error: Class 'DOMImplementation' not found in /usr/share/php/Icinga/Chart/SVGRenderer.php:127\nStack trace:\n#0 /usr/share/php/Icinga/Chart/SVGRenderer.php(231): Icinga\\Chart\\SVGRenderer->createRootDocument()\n#1 /usr/share/php/Icinga/Chart/Chart.php(127): Icinga\\Chart\\SVGRenderer->render()\n#2 /usr/share/php/Icinga/Web/Widget/Chart/InlinePie.php(245): Icinga\\Chart\\Chart->render()\n#3 /usr/share/icingaweb2/modules/monitoring/application/views/helpers/Perfdata.php(67): Icinga\\Web\\Widget\\Chart\\InlinePie->render()\n#4 /usr/share/icingaweb2/library/vendor/Zend/View/Abstract.php(345): Zend_View_Helper_Perfdata->perfdata()\n#5 /usr/share/php/Icinga/Web/View.php(251): Zend_View_Abstract->__call()\n#6 /usr/share/icingaweb2/modules/monitoring/application/views/scripts/list/services.phtml(117): Icinga\\Web\\View->__call()\n#7 /usr/share/php/Icinga/Web/View.php(235): include('/usr/share/icin...')\n#8 /usr/share/icingaweb2/library/vendor/Zend/View/Abstract.php(877): Icinga\\Web\\View...',

According to an issue reported back in 2017, this has to do with yet another missing PHP module, php-xml this time. Let's install that one, too:

root@icingaweb:~# apt-get install php7.4-xml
root@icingaweb:~# systemctl restart php7.4-fpm

After the PHP-FPM restart the errors were gone and the Icingaweb2 UI worked fine again.

Interesting though, that this has worked prior to the Icingaweb2 package upgrade.

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