I am new to the owncloud and followed the pimylifeup.com article on creating your own cloud using owncloud. And if the tutorial it had me install version 10.2.1 but when I get into the web interface it tells me I need to update. So when I tried to by turning on maintenance mode from /var/www/owncloud I get this error. This version of ownCloud is not compatible with PHP 7.3, You are currently running PHP 7.3.14~deb10u1. So if the version of ownCloud I have installed doesn’t work with the version of PHP I got how do I update to 10.4.1? Any help would be much appreciated.
I got the same challenge updating PHP7.0 with the OCUpdate to 10.4.0 on raspbian. I also got PHP7.3 not running, but maybe I did something wrong. In my case I moved back to PHP 7.2 but need to compile the PHP memcache modules from source.
libapache2-mod-php7.3 7.3.14-1~deb10u1 armhf server-side, HTML-embedded scripting language (Apache 2 module)
ii php 2:7.3+69 all server-side, HTML-embedded scripting language (default)
ii php-apcu 5.1.17+4.0.11-1 armhf APC User Cache for PHP
ii php-apcu-bc 1.0.4-4 armhf APCu Backwards Compatibility Module
ii php-common 2:69 all Common files for PHP packages
ii php-curl 2:7.3+69 all CURL module for PHP [default]
ii php-fpm 2:7.3+69 all server-side, HTML-embedded scripting language (FPM-CGI binary) (default)
ii php-gd 2:7.3+69 all GD module for PHP [default]
ii php-igbinary 3.0.0-1 armhf igbinary PHP serializer
ii php-intl 2:7.3+69 all Internationalisation module for PHP [default]
ii php-mbstring 2:7.3+69 all MBSTRING module for PHP [default]
ii php-memcached 3.1.3+2.2.0-1 armhf memcached extension module for PHP, uses libmemcached
ii php-msgpack 2.0.3-1 armhf PHP extension for interfacing with MessagePack
ii php-mysql 2:7.3+69 all MySQL module for PHP [default]
ii php-redis 4.2.0-1 armhf PHP extension for interfacing with Redis
ii php-zip 2:7.3+69 all Zip module for PHP [default]
ii php7.3 7.3.14-1~deb10u1 all server-side, HTML-embedded scripting language (metapackage)
ii php7.3-cgi 7.3.14-1~deb10u1 armhf server-side, HTML-embedded scripting language (CGI binary)
ii php7.3-cli 7.3.14-1~deb10u1 armhf command-line interpreter for the PHP scripting language
ii php7.3-common 7.3.14-1~deb10u1 armhf documentation, examples and common module for PHP
ii php7.3-curl 7.3.14-1~deb10u1 armhf CURL module for PHP
ii php7.3-fpm 7.3.14-1~deb10u1 armhf server-side, HTML-embedded scripting language (FPM-CGI binary)
ii php7.3-gd 7.3.14-1~deb10u1 armhf GD module for PHP
ii php7.3-intl 7.3.14-1~deb10u1 armhf Internationalisation module for PHP
ii php7.3-json 7.3.14-1~deb10u1 armhf JSON module for PHP
ii php7.3-mbstring 7.3.14-1~deb10u1 armhf MBSTRING module for PHP
ii php7.3-mysql 7.3.14-1~deb10u1 armhf MySQL module for PHP
ii php7.3-opcache 7.3.14-1~deb10u1 armhf Zend OpCache module for PHP
ii php7.3-phpdbg 7.3.14-1~deb10u1 armhf server-side, HTML-embedded scripting language (PHPDBG binary)
ii php7.3-readline 7.3.14-1~deb10u1 armhf readline module for PHP
ii php7.3-xml 7.3.14-1~deb10u1 armhf DOM, SimpleXML, WDDX, XML, and XSL module for PHP
ii php7.3-zip 7.3.14-1~deb10u1 armhf Zip module for PH
As you see version 10.3.0 only started supporting PHP version 7.3. You should be able to update to version 10.3 before updating your PHP version and you should be fine, no reinstall/reimaging necessary.