Hello, I am running Fedora 44 with GNOME 50. I installed GNOME Builder via Flatpak and created a GTK4 project with it. I wanted to format the Python file but it did not work, it failed with the error message: “No language server” connected. I checked the Builder settings, the Python lsp is activate…

Hi, Does that help? [image] I’m not getting any Python auto-completion inside Builder Applications Hi everyone, I’m building my first GTK4/GNOME application using GNOME Builder. The IDE generated the base Python project for me and it runs correctly, so the s…

Hey, thanks for your reply. I found both threads before I posted and I tried them but both do not work. According to Builder’s README it should just work if it’s installed: Builder comes with support for a number of language servers builtin. It automatically locates the language server within yo…

Can you try running Builder in verbose mode? gnome-builder -vvv and check if there are any suspicious logs?

It’s interesting… ~$ LANG=en_GB gnome-builder -vvv 17:20:51.6020 main[ 17586]: MESSAGE: GNOME Builder 50.0 (50.0) from channel "other" starting with ABI 50 17:20:51.6021 main[ 17586]: MESSAGE: Initializing with GNOME deskto…

[image] apollo7321: 17:20:59.2222 GtkSourceView[ 17586]: DEBUG: No client to deliver request population failed That looks suspicious… I’ll give a try on my side and compare the debug output.

Code completion works on my side, here some filtered logs: 16:18:18.3377 ide-lsp-service[ 71273]: DEBUG: Pipeline changed, requesting LSP service ruff+IdeLspPluginService restart 16:18:18.3377 ide-lsp-service[ 71273]: DEBUG: Request to resta…

Hmm… Strange… Thanks for testing. I think I’ll test it when I’ve got some time in a clean virtual machine. Currently it works in VSCodium so far. Not perfect, but it works.

How to configure Python lsp in GNOME Builder?

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gwillems October 4, 2026, 1:46pm 2

Hi,

Does that help?