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Flutter Inspector Stuck at Installing DevTools, won't display

See original GitHub issue

Steps to Reproduce

When I run a Flutter app in IntelliJ, with the “Open Flutter Inspector view on app launch” setting set to true (or if I just open it by clicking on the sidebar tab), it will put up a progress bar that says “Starting DevTools” for about 15-20 seconds, and then it will show the following:

I’ve tried following those instructions multiple times, restarting IntelliJ and clearing caches, restarting my app, and uninstalling and reinstalling the Flutter and Dart plugins (restarting in between), and it still won’t start the inspector.

When I run with verbose output, it does print the following once the app starts:

[{"event":"app.started","params":{"appId":"cf719a58-20d4-4b61-b0bb-ed39d4cfd839"}}]
Activating Dart DevTools...
[{"event":"app.progress","params":{"appId":"cf719a58-20d4-4b61-b0bb-ed39d4cfd839","id":"2","progressId":null,"message":"Activating Dart DevTools...","finished":false}}]
[{"event":"app.progress","params":{"appId":"cf719a58-20d4-4b61-b0bb-ed39d4cfd839","id":"2","progressId":null,"finished":true}}]
[{"id":0,"result":{"value":"linux","type":"_extensionType","method":"ext.flutter.platformOverride"}}]
[{"id":1,"result":{"timeDilation":"1.0","type":"_extensionType","method":"ext.flutter.timeDilation"}}]
[{"id":2,"result":{"enabled":"false","type":"_extensionType","method":"ext.flutter.debugPaint"}}]
[{"id":3,"result":{"enabled":"false","type":"_extensionType","method":"ext.flutter.debugPaintBaselinesEnabled"}}]
[{"id":4,"result":{"enabled":"false","type":"_extensionType","method":"ext.flutter.repaintRainbow"}}]
[{"id":5,"result":{"enabled":"false","type":"_extensionType","method":"ext.flutter.showPerformanceOverlay"}}]
[{"id":6,"result":{"enabled":"true","type":"_extensionType","method":"ext.flutter.debugAllowBanner"}}]
[{"id":7,"result":{"enabled":"false","type":"_extensionType","method":"ext.flutter.inspector.structuredErrors"}}]
[{"id":8,"result":{"enabled":"false","type":"_extensionType","method":"ext.flutter.inspector.show"}}]
[{"id":9,"result":{"enabled":"false","type":"_extensionType","method":"ext.flutter.inspector.trackRebuildDirtyWidgets"}}]
[{"id":10,"result":{"enabled":"false","type":"_extensionType","method":"ext.flutter.inspector.trackRepaintWidgets"}}]
[{"id":11,"result":{"enabled":"true","type":"_extensionType","method":"ext.flutter.inspector.structuredErrors"}}]
[{"id":12,"result":{"enabled":"false","type":"_extensionType","method":"ext.flutter.inspector.trackRebuildDirtyWidgets"}}]
[{"id":13,"result":{"enabled":"false","type":"_extensionType","method":"ext.flutter.inspector.trackRepaintWidgets"}}]

Version info

[✓] Flutter (Channel master, 2.3.0-17.0.pre.576, on Debian GNU/Linux rodete 5.10.28-1rodete2-amd64, locale en_US.UTF-8)
    • Flutter version 2.3.0-17.0.pre.576 at /home/gspencer/code/flutter
    • Upstream repository git@github.com:gspencergoog/flutter.git
    • Framework revision 1c92e84865 (20 hours ago), 2021-06-29 16:21:02 -0700
    • Engine revision aa939d4cf9
    • Dart version 2.14.0 (build 2.14.0-256.0.dev)

[✓] Chrome - develop for the web
    • Chrome at google-chrome

[✓] Linux toolchain - develop for Linux desktop
    • Debian clang version 11.0.1-2
    • cmake version 3.18.4
    • ninja version 1.8.2
    • pkg-config version 0.29.2

[✓] IntelliJ IDEA Community Edition (version 2021.1)
    • IntelliJ at /opt/idea-IC-202.7660.26
    • Flutter plugin version 57.0.5
    • Dart plugin version 211.7665

[✓] VS Code (version 1.57.1)
    • VS Code at /usr/share/code
    • Flutter extension version 3.23.0

[✓] Connected device (2 available)
    • Linux (desktop) • linux  • linux-x64      • Debian GNU/Linux rodete 5.10.28-1rodete2-amd64
    • Chrome (web)    • chrome • web-javascript • Google Chrome 91.0.4472.114