If you upgrade to Ubuntu 20.04 or newer, or install a new server with this Ubuntu. The Self signed certificates has to be re-created on the server to allow browsers to connect.
The logs will show everything is started up properly without errors, the browser will just not be allowed to connect to the old certificates.
This command is supposed to show the certificate information:
openssl s_client 127.0.0.1:3080
But if you get this, then the certificates are to old or missing.
CONNECTED(00000003)
write:errno=104
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no peer certificate available
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No client certificate CA names sent
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SSL handshake has read 0 bytes and written 283 bytes
Verification: OK
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Run this command it the site is using the Datatex self signed certificates to generate new ones:
/opt/amethyst/etc/make_certificates
Then refresh your browser page and you should be able to connect.