I'm attempting to upgrade from OMV4 to OMV5. I began with dliedert's script, which fails with:
PHP Fatal error: Uncaught Error: Call to undefined function mb_strtolower() in /usr/share/php/openmediavault/autoloader.inc:28
The failure is at line 8454 in the attached log dated 2021-06-30-075916.
After that, I find my OMV server has buster installed, so dliedert's script won't continue. Apache is running, so the rest of the server seems okay. After doing some reading and searching, I tried uninstalling and re-installing mb-7.3string, but that didn't change anything. After the above failure using dliedert's script, I could only execute 'omv-update' and it continually fails with the same error. Thanks for any help.