Update plugins and dependencies after migration -> 4.0.3

[NordBee]

Version

4.0.3

Environment info

Environment Info:

  System:
    OS: macOS 10.15
    CPU: (16) x64 Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz
  Binaries:
    Node: 10.16.0 - /usr/local/bin/node
    Yarn: Not Found
    npm: 6.12.0 - /usr/local/bin/npm
  Browsers:
    Chrome: 77.0.3865.120
    Firefox: 69.0.3
    Safari: 13.0.2
  npmGlobalPackages:
    @vue/cli: 4.0.3

Steps to reproduce

I used npm install -g @vue/cli
And vue upgrade

After migration fom version 3 to 4
I have problems that in the plugins and dependencies section I can’t update anything since it says that the latest version of all plugins is 0.0.1
This problem is in all projects.

What is expected?

What is actually happening?

[ShinZ6]

Same problem here.

[NordBee]

[NordBee]

I tried reinstalling vue but the result did not change

[haoqunjiang]

Current workaround: npm i -g yarn. There's a bug in the UI backend code that the fallback logic when yarn is not installed is wrong.