In https://help.univention.com/t/17948 we are asked to open a new topic for the python_ucr_template_compatibility error. Here is another one that might make it to your list:
python_ucr_template_compatibility:
The following UCR templates are not compatible with Python 3:
/etc/univention/templates/files/etc/ldap/slapd.conf.d/11univention-ldap-usercert_schema (package: univention-ldap-usercert)
Hello Hans,
as univention-ldap-usercert stems from a Cool Solution, namely Cool Solution - Creation and management of user and Windows certificates, we cannot give a date for this to be fixed, but we have noted your submission.
Best regards
Jan-Luca
Hi,
is there any status update?
Thank you 
+1 on “any status update”
Is there still no update?
Hello,
we are working on bringing the Cool Solution to UCS 5.0, but I cannot give an estimation when this will be released.
Best regards
Jan-Luca
Is there any update now?
As I neither I nor my team are working on this I cannot tell you more about the status, sorry.
What I can say is that we are still working on this - If you want to look into ways to speed this up I would suggest to get in touch with your Service or Sales contact if available.