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I wanted to install a flatpak image from source code. Inside the manifest file, it is specified that rust-stable is required.

"sdk-extensions": [
    "org.freedesktop.Sdk.Extension.rust-stable"
],

The specified Rust flatpak is already installed on my system twice:

$ flatpak list|grep Rust
Rust stable org.freedesktop.Sdk.Extension.rust-stable   1.55.0  20.08   flathub system
Rust stable org.freedesktop.Sdk.Extension.rust-stable   1.55.0  20.08   flathub user

But when I try to build and install the flatpak, it tells me that the rust-stable flatpak is not available:

$ flatpak-builder --install --force-clean mysoftware com.example.MySoftware.Devel.json

(flatpak-builder:18580): Json-CRITICAL **: 10:37:25.850: json_object_get_string_member: assertion 'node != NULL' failed

(flatpak-builder:18580): flatpak-builder-WARNING **: 10:37:25.850: Missing source type

(flatpak-builder:18580): Json-WARNING **: 10:37:25.851: Failed to deserialize "sources" property of type "gpointer" for an object of type "BuilderModule"
Downloading sources
Initializing build dir
error: Requested extension org.freedesktop.Sdk.Extension.rust-stable not installed

Why doesn't flatpak find the package?

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2 Answers 2

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In addition to Zaclegarssure's answer, to install the latest (master branch) flatpak packages probably required, you need to install packages for example from the gnome-nightly repository by

flatpak remote-add --if-not-exists gnome-nightly https://nightly.gnome.org/gnome-nightly.flatpakrepo

and install a nightly app by

flatpak install gnome-nightly org.gnome.Sdk

See https://wiki.gnome.org/Apps/Nightly.

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  • Thanks for the answer. I already managed to solve it in the meantime, but I don't recall the exact way how to. Commented Dec 12, 2022 at 8:37
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You probably didn't install the right branch of rust-stable. One thing you can do is to add: --install-deps-from=flathub to the flatpak-builder command, it will automatically download every dependencies, such as runtime and skd-extensions, with the right version.

Hope that helps.

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  • When I do that, it tries to install org.gnome.Sdk/x86_64/master, but ultimately fails to do so: error: Nothing matches org.gnome.Sdk in remote flathub. Commented May 7, 2022 at 10:56

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