magento2: The errors occur using Magento 2.4.4 with PHP 8.1 on a Linux Apache server

Preconditions (*)

1. Magento 2.4.4
2. Php 8.1
3. Linux apache cPanel

Steps to reproduce (*)

1. install Magento 2.4.4 through Softaculous app installer
2. Update Php version from 7.3 to 8.1 with the help of multiPHP manager

Expected result (*)

Demo/Default Pages and Admin Panel should display properly.

Actual result (*)

Error: Undefined constant "Magento\Framework\Encryption\Adapter\SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES" in /home4/wardyvgq/public_html/vendor/magento/framework/Encryption/Adapter/SodiumChachaIetf.php:40
Stack trace:
#0 /home4/wardyvgq/public_html/vendor/magento/framework/Encryption/Encryptor.php(399): Magento\Framework\Encryption\Adapter\SodiumChachaIetf->encrypt('a:3:{s:7:"defau...')
#1 /home4/wardyvgq/public_html/vendor/magento/module-config/App/Config/Type/System.php(339): Magento\Framework\Encryption\Encryptor->encryptWithFastestAvailableAlgorithm('a:3:{s:7:"defau...')
#2 /home4/wardyvgq/public_html/vendor/magento/framework/Cache/LockGuardedCacheLoader.php(137): Magento\Config\App\Config\Type\System->cacheData(Array)
#3 /home4/wardyvgq/public_html/vendor/magento/module-config/App/Config/Type/System.php(281): Magento\Framework\Cache\LockGuardedCacheLoader->lockedLoadData('SYSTEM_CONFIG', Object(Closure), Object(Closure), Object(Closure))
#4 /home4/wardyvgq/public_html/vendor/magento/module-config/App/Config/Type/System.php(207): Magento\Config\App\Config\Type\System->loadDefaultScopeData('default')
#5 /home4/wardyvgq/public_html/vendor/magento/module-config/App/Config/Type/System.php(181): Magento\Config\App\Config\Type\System->getWithParts('default/admin/u...')
#6 /home4/wardyvgq/public_html/vendor/magento/framework/App/Config.php(132): Magento\Config\App\Config\Type\System->get('default/admin/u...')
#7 /home4/wardyvgq/public_html/vendor/magento/module-backend/App/Config.php(51): Magento\Framework\App\Config->get('system', 'default/admin/u...')
#8 /home4/wardyvgq/public_html/vendor/magento/module-backend/App/Area/FrontNameResolver.php(109): Magento\Backend\App\Config->getValue('admin/url/use_c...')
#9 /home4/wardyvgq/public_html/vendor/magento/module-backend/Helper/Data.php(209): Magento\Backend\App\Area\FrontNameResolver->getFrontName(false)
#10 /home4/wardyvgq/public_html/vendor/magento/module-backend/App/Request/PathInfoProcessor.php(50): Magento\Backend\Helper\Data->getAreaFrontName()
#11 /home4/wardyvgq/public_html/generated/code/Magento/Backend/App/Request/PathInfoProcessor/Proxy.php(95): Magento\Backend\App\Request\PathInfoProcessor->process(Object(Magento\Framework\App\Request\Http), '/admin_backend')
#12 /home4/wardyvgq/public_html/vendor/magento/framework/App/Request/Http.php(148): Magento\Backend\App\Request\PathInfoProcessor\Proxy->process(Object(Magento\Framework\App\Request\Http), '/admin_backend')
#13 /home4/wardyvgq/public_html/vendor/magento/framework/App/Request/Http.php(163): Magento\Framework\App\Request\Http->getOriginalPathInfo()
#14 /home4/wardyvgq/public_html/vendor/magento/framework/App/Request/Http.php(213): Magento\Framework\App\Request\Http->getPathInfo()
#15 /home4/wardyvgq/public_html/vendor/magento/framework/App/Http.php(111): Magento\Framework\App\Request\Http->getFrontName()
#16 /home4/wardyvgq/public_html/generated/code/Magento/Framework/App/Http/Interceptor.php(23): Magento\Framework\App\Http->launch()
#17 /home4/wardyvgq/public_html/vendor/magento/framework/App/Bootstrap.php(264): Magento\Framework\App\Http\Interceptor->launch()
#18 /home4/wardyvgq/public_html/pub/index.php(30): Magento\Framework\App\Bootstrap->run(Object(Magento\Framework\App\Http\Interceptor))
#19 {main}

Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.