After reading Wahahey's posts, it reminded me that I had noticed when running epubcheck that it was using 5.0.0. I checked my epubcheck's version, saw that it was listed as 0.4.6.2 so I removed it and downloaded and installed 0.4.6.3 from the link Doitsu provided.
Then I ran epubcheck on a good file and immediately the plugin runner informed me that it had found a new version, 5.0.0 which it proceeded to download and install from :
github.com/w3c/epubcheck/releases/download/v5.0.0/epubcheck-5.0.0.zip
Then it ran epubcheck 5.0.0 with no fault found. I introduced a simple error and reran epubcheck 5.0.0 and it correctly found the error.
Curiously, when I open Plugins/Manage plugins, it shows that I have epubcheck 0.4.6.3 installed. No mention of 5.0.0 except when actually running the plugin to check a file.
I am using Sigil 1.9.20 from the website's flatpak link in UbuntuStudio 22.04LTS. Sigil and epubcheck validation appears to be working ok with 5.0.0
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