superset: docker-compose up, reaches completion of init Step 4, but the welcome screen is not functional

A clear and concise description of what the bug is.

Expected results

A functional welcome screen after successful login (admin, admin)

Actual results

The welcome screen (http://localhost:8088/superset/welcome ) contains three items, two (non functional) buttons (one shows x, other shows close) and a not-loaded image (maybe loading.gif). Otherwise the welcome page is blank. During docker-compose up I noticed some lines in red which may be errors. See attachment for the stdout of the docker-compose up.

Screenshots

N/A

How to reproduce the bug

Using ubuntu 18.04.5 LTS with docker 19.03.12 with docker-compose 1.26.2

On 03/September/2020

git clone https://github.com/apache/incubator-superset/ cd incubator-superset docker-compose up

…when stdout showed Init Step 4/4 [Complete] -- Setting up roles and perms

opened my browser (either chromium or firefox latest) at http://localhost:8088 Login admin with password admin (success) The browser displays the url localhost:8088/superset/welcome, but that seems to be a mostly empty screen , with two buttons, one with x, other with Close. Clicking on either of these buttons has no effect.

There is also an image in the centre of the screen , maybe loading.fig, but not rendered.

Environment

• superset version: superset version $ git log commit 824cea24bad8aa330f288142cab989407577e3af (HEAD -> master, origin/master, origin/HEAD) Author: Evan Rusackas evan@preset.io Date: Wed Sep 2 23:13:58 2020 -0700

  More Label touchups (margins) (#10722)

  • labels with onClick don’t need .pointer. No labels need m-r-5

  • making Timer a proper Label

  • a little linting

  • addresing (helpful, thanks) comment

• python version: python --version (per dockerfile)

• node.js version: node -v (per dockerfile)

• npm version: npm -v (per dockerfile)

Checklist

Make sure these boxes are checked before submitting your issue - thank you!

• [x ] I have checked the superset logs for python stacktraces and included it here as text if there are any.
• [ x] I have reproduced the issue with at least the latest released version of superset.
• [x ] I have checked the issue tracker for the same issue and I haven’t found one similar.

Additional context

N/A