Copying Contents of /Data Directory from a 3.0 Instance of CouchDB(Windows 10) to the /Data directory(/var/lib/couchdb)(data) Directory of Ubuntu 20.04

[John Le Brasseur]

Hi.
I copied the entire Couchdb 3.0 Installation from my Windows 10
installation and saved it.
I have a new Ubuntu 20.04 installation.
After correctly installing CouchDB 3.1 on Ubuntu I deleted all files in the
/var/lib/couchdb(data) directory and copied the files from my Windows /data
directory into it.
I changed ownership to couchdb:couchdb and directory modes to 755 and file
modes to 644.
Using curl I can access couchdb and _all_dbs. but when accessing a
particular database I get
{
  "error": "internal_server_error",
  "reason": "No DB shards could be opened.",
  "ref": 2822102114
}
Also, the databases are greyed out in fauxton.

Obviously this is not best practice, but is there a way to make this work?

-- 
Many thanks.

John Le Brasseur