[Trac] trac 1.6 error unknown encoding: utf8mb4

Hello,
I've struggled to move an old trac 1.2 wiki, ticket and repo browser from 
CentOs 7 to ubuntu 24.04.  
I have everything almost working now though.
I first had to move the subversion rep, now on 1.14.
Then I installed trac 1.6 and upgraded the database using trac-admin.
I think before I did that I recreated the db from a backup, but changed the 
character set and collation to 
DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_bin
I thought I read on the trac site that that needed to be done.

After the wiki and tickets seemed to be working, I used the admin interface 
to set up the repository browser.
All of that is working except when I drill down and click on the revision 
(changeset maybe) and or the file, I get the following error:
*Trac detected an internal error:*LookupError: unknown encoding: utf8mb4
onthe web browser.
Maybe I picked the wrong character set and colation?
If so what should it be

Am attaching a pdf of the output from the webpage.  I can also post the 
logs if that will help
Thanks in advance.
 

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