Greetings!

I installed DSpace 7.2 on Ubuntu 20.04 and migrated the database and the 
assetstore. Backend installed fine, HAL browser shows the contents 
correctly, SOLR is running. 

Followed the Frontend installation instructions. Now, "pm start 
dspace-ui.json" output shows that dspace-ui is online.  
 http://localhost:8080/server/api has 3 tabs, the first one, JSON, shows 
dspaceUI as "http://localhost:4000";, and dspaceServer as 
"http://localhost:8080/server";. 

lsof -i:4000 shows:

COMMAND node\x20
PID                16129
USER             dspace
FD                  20u
TYPE              IPv4
DEVICE          188128
SIZE/OFF       0t0
NODE             TCP
NAME            localhost:4000 (LISTEN)

However, when I try to go to http://localhost:4000, the browser says 
"Unable to connect".

I followed the instructions 
at 
https://wiki.lyrasis.org/display/DSPACE/Troubleshoot+an+error#Troubleshootanerror-FindingtheErrorMessageintheUserInterface(Trythisfirst!)
 
and reproduced the problem in Chrome and Firefox with similar results.

In Chrome, Console shows:

VM487:6792 crbug/1173575, non-JS module files deprecated.
(anonymous) @ VM487:6792


Network -> Headers shows:

Request URL:
http://localhost:4000/
Referrer Policy:strict-origin-when-cross-origin
Request Headers
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding:gzip, deflate, br
Accept-Language:en-US,en;q=0.9
Cache-Control:max-age=0
Connection:keep-alive
Host:localhost:4000
sec-ch-ua:"Google Chrome";v="105", "Not)A;Brand";v="8", "Chromium";v="105"
sec-ch-ua-mobile:?0
sec-ch-ua-platform:"Linux"
Sec-Fetch-Dest:document
Sec-Fetch-Mode:navigate
Sec-Fetch-Site:none
Sec-Fetch-User:?1
Upgrade-Insecure-Requests:1
User-Agent:Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like 
Gecko) Chrome/105.0.0.0 Safari/537.36

while Network -> Response only says:

Failed to load response data: No  resource with given identifier found

What am I missing?

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