I suspect apt-get install php-xml in your vagrant machine may fix it
I had this message too, but I run my own WordPress server, on a Debian buster system using the packaged wordpress.
My apache logs showed that it was failing due to
PHP Fatal error: Uncaught Error: Call to undefined function simplexml_load_file() in /var/lib/wordpress/wp-content/plugins/svg-support/functions/attachment.php:40
The solution for me was
apt-get install php7.4-xml
I suspect Ubuntu systems will show a similar error. It may be worth an explicit check for this situation.
I have found the issue – I run WordPress Multisite, and the plugin was enabled at the Multisite level.
Deactivating at Multisite, and enabling for the individual site removed the error.
