install of 1.6.4 completed successfully.

Postgresql, nginx, roundcube...

when i navigate to mydomain/mail i see:

Oops... something went wrong!
An internal error has occurred. Your request cannot be processed at this time.

For administrators: Please check the application and/or server error logs for more information.

**This is in the nginx access log:

162.158.224.175 - - [28/Jul/2023:16:27:59 +0000] "POST /mail/?_task=mail&_action=refresh HTTP/2.0" 200 64 "https://mail.domain.com/mail/?_task=mai … mbox=INBOX" "Mozilla/5.0 (X11; Linux x86_64) Apple>
134.122.89.242 - - [28/Jul/2023:16:31:35 +0000] "\x16\x03\x01\x00\xEA\x01\x00\x00\xE6\x03\x031#\x99\xE9\xC2\xE7\xBE\xDF,\xB3\xF0}\xCF\x98\x02\xC7\x057\xE1\x10\xFC\xB8}9\xAF+\xF2\x8F\xC7<T/ \xAC6\x814\xC>
134.122.89.242 - - [28/Jul/2023:16:31:35 +0000] "GET / HTTP/1.1" 301 162 "-" "-"
134.122.89.242 - - [28/Jul/2023:16:31:35 +0000] "GET / HTTP/1.1" 301 162 "-" "Mozilla/5.0 (Linux; Android 6.0; HTC One M9 Build/MRA726009) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.3227.98 Mobi>
134.122.89.242 - - [28/Jul/2023:16:31:35 +0000] "GET /.vscode/sftp.json HTTP/1.1" 301 162 "-" "Go-http-client/1.1"
134.122.89.242 - - [28/Jul/2023:16:31:36 +0000] "GET /about HTTP/1.1" 301 162 "-" "Go-http-client/1.1"
134.122.89.242 - - [28/Jul/2023:16:31:36 +0000] "GET /debug/default/view?panel=config HTTP/1.1" 301 162 "-" "Go-http-client/1.1"
134.122.89.242 - - [28/Jul/2023:16:31:36 +0000] "GET /v2/_catalog HTTP/1.1" 301 162 "-" "Go-http-client/1.1"
134.122.89.242 - - [28/Jul/2023:16:31:36 +0000] "GET /ecp/Current/exporttool/microsoft.exchange.ediscovery.exporttool.application HTTP/1.1" 301 162 "-" "Go-http-client/1.1"
134.122.89.242 - - [28/Jul/2023:16:31:37 +0000] "GET /server-status HTTP/1.1" 301 162 "-" "Go-http-client/1.1"
134.122.89.242 - - [28/Jul/2023:16:31:37 +0000] "GET /login.action HTTP/1.1" 301 162 "-" "Go-http-client/1.1"
134.122.89.242 - - [28/Jul/2023:16:31:37 +0000] "GET /_all_dbs HTTP/1.1" 301 162 "-" "Mozilla/5.0 (l9scan/2.0.9373e25333e29393e2239313; +https://leakix.net)"
134.122.89.242 - - [28/Jul/2023:16:31:37 +0000] "GET /.DS_Store HTTP/1.1" 301 162 "-" "Go-http-client/1.1"
134.122.89.242 - - [28/Jul/2023:16:31:38 +0000] "GET /.env HTTP/1.1" 301 162 "-" "Go-http-client/1.1"
134.122.89.242 - - [28/Jul/2023:16:31:38 +0000] "GET /.git/config HTTP/1.1" 301 162 "-" "Go-http-client/1.1"
134.122.89.242 - - [28/Jul/2023:16:31:38 +0000] "GET /s/9373e25333e29393e2239313/_/;/META-INF/maven/com.atlassian.jira/jira-webapp-dist/pom.properties HTTP/1.1" 301 162 "-" "Go-http-client/1.1"
134.122.89.242 - - [28/Jul/2023:16:31:38 +0000] "GET /config.json HTTP/1.1" 301 162 "-" "Go-http-client/1.1"
134.122.89.242 - - [28/Jul/2023:16:31:39 +0000] "GET /telescope/requests HTTP/1.1" 301 162 "-" "Go-http-client/1.1"
134.122.89.242 - - [28/Jul/2023:16:31:39 +0000] "GET /?rest_route=/wp/v2/users/ HTTP/1.1" 301 162 "-" "Go-http-client/1.1"
172.70.162.69 - - [28/Jul/2023:16:39:42 +0000] "GET / HTTP/2.0" 304 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36"
172.70.162.69 - - [28/Jul/2023:16:39:42 +0000] "GET /mail/ HTTP/2.0" 200 426 "https://mail.domain.com/" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari>
172.70.162.69 - - [28/Jul/2023:16:40:03 +0000] "GET /mail/ HTTP/2.0" 200 426 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36"
172.70.90.8 - - [28/Jul/2023:16:40:43 +0000] "GET /mail/ HTTP/2.0" 200 426 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0"
141.101.98.143 - - [28/Jul/2023:16:44:25 +0000] "GET /mail/ HTTP/2.0" 200 426 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36"

** nginx error logs empty

Please kindly assist me... I'm using ubuntu 22.04 and the downloaded installer

Further info on request

many thanks,
Sam