I would also rather solve this problem than work around it. Reinstalling is not solved ...
What output do you need?
I have tried all of the proposed actions several times, in some cases I had found these solutions long before my question and tried several times.
The result is always the same ... I can't get this "omvextrasorg 5.2.1" from the extension list, and omv quits trying to install this package with the message:
"the following packages have unmet dependencies:
openmediavault-omvextrasorg : Depends openmediavault (>= 5.0) but
it is not going to be installed
E: Unable to correct problems, you have held broken packages."
I've tried:
"https://forum.openmediavault.org/index.php/Thread/5549-OMV-Extras-org-Plugin/"
"apt-get purge openmediavault-omvextrasorg" ... restart and then "https://forum.openmediavault.org/index.php/Thread/5549-OMV-Extras-org-Plugin/"
"apt-get clean" ...restart and then "https://forum.openmediavault.org/index.php/Thread/5549-OMV-Extras-org-Plugin/" i also tried the alternate method in this link.
By the way the source in this link (For OMV 5.x (usul) - github.com/OpenMediaVault-Plug…extrasorg_latest_all5.deb) is what i inadvertently following these instructions put to the extension site.
All my search in the web to fix this problem i found i tried but no attempt i found solved the problem.