Notebook fails to open

[diazdc]

Environment data

• VS Code version: Version: 1.55.0-insider
  Commit: 469e4f6e2755b220dae3eccb04d1ddc587b84a5a
  Date: 2021-03-22T07:48:57.578Z
  Electron: 11.3.0
  Chrome: 87.0.4280.141
  Node.js: 12.18.3
  V8: 8.7.220.31-electron.0
  OS: Linux x64 5.8.0-45-generic

• Jupyter Extension version: v2021.4.678042391

• Python Extension version: v2021.4.677374727-dev

• OS: Kubuntu 20.04

• Python and/or Anaconda version: 3.8.5

• Type of virtual environment used : Conda

• Jupyter server running: Remote

Expected behaviour

Opening a jupyter notebook works.

Actual behaviour

I get the following error when opening a new or existing notebook (please see screenshots):

"Cannot open resource with notebook editor type 'jupyter-notebook', please check if you have the right extension installed or enabled."

Steps to reproduce:

Open a jupyter notebook, either new or existing.

(edit:) Downgraded to v2021.4.641214696 and notebooks open without any problem

[rchiodo]

If you upgrade VS code insiders to the latest release, this will go away.

Dupe of #5251