I have been trying to install / enable Talk on 17.0.3 running as docker on unRaid and have been getting the following error:
An error occured during the request. Unable to proceed.
The column ‘in_call’ on table ‘oc_talk_participants’ already exists.
How do I go about fixing it?
Thank you.
I would recommend to drop the mentioned table and try the installation again 
Sorry, but what do you mean by “drop the table”?
Unfortunately you ignored the issue template and didn’t provide any valueable information about your environment, therefore I assumed that you would know how to access your Nextcloud database and drop (delete) the mentioned database table.