try o fix ubuntu build

npm_install.py

@@ -582,6 +582,17 @@ def install_node_and_yarn(node_pkg: str):
     if not Path("/usr/bin/yarn").exists() and Path("/usr/bin/yarnpkg").exists():
         os.symlink("/usr/bin/yarnpkg","/usr/bin/yarn")
 
+def _is_ubuntu_wo_distutils() -> bool:
+    try:
+        dist = (OSREL.get("ID","") or "").lower()
+        ver  = (OSREL.get("VERSION_ID","") or "").strip()
+        def _vers(t): 
+            parts = (ver.split(".") + ["0","0"])[:2]
+            return (int(parts[0]), int(parts[1]))
+        return dist == "ubuntu" and _vers(ver) >= (24, 4)
+    except Exception:
+        return False
+
 def _prepare_sass(frontend_dir: Path):
     pj = frontend_dir / "package.json"
     if not pj.exists():
@@ -599,7 +610,8 @@ def _prepare_sass(frontend_dir: Path):
     if not has_node_sass:
         return 
 
-    use_dart = (os.environ.get("USE_DART_SASS","").strip() == "1")
+    env_flag = (os.environ.get("USE_DART_SASS","").strip())
+    use_dart = (env_flag == "1") or (env_flag == "" and _is_ubuntu_wo_distutils())
 
     data.setdefault("dependencies", {})
     data.setdefault("devDependencies", {})
@@ -609,27 +621,32 @@ def _prepare_sass(frontend_dir: Path):
         data["devDependencies"].pop("node-sass", None)
         if "sass" not in data["dependencies"] and "sass" not in data["devDependencies"]:
             data["devDependencies"]["sass"] = "^1.77.0"
+
         scripts = (data.get("scripts") or {})
-        new_scripts = {}
+        data["scripts"] = {k: re.sub(r"\bnode-sass\b", "sass", v or "") for k, v in scripts.items()}
-        for k, v in scripts.items():
+
-            new_scripts[k] = re.sub(r"\bnode-sass\b", "sass", v or "")
+        if env_flag == "":
-        data["scripts"] = new_scripts
+            os.environ["USE_DART_SASS"] = "1"
     else:
         target = "^9.0.0"
         if "node-sass" in data["dependencies"]:
             data["dependencies"]["node-sass"] = target
         else:
             data["devDependencies"]["node-sass"] = target
+
         res = (data.get("resolutions") or {})
         res["node-gyp"]   = "^10.0.0"
         res["node-sass"]  = "^9.0.0"
         data["resolutions"] = res
+
         os.environ["npm_config_node_sass_binary_site"] = "https://github.com/sass/node-sass/releases/download"
 
     pj.write_text(json.dumps(data, indent=2, ensure_ascii=False) + "\n", encoding="utf-8")
 
 
 def _build_frontend(src_frontend: Path, dest_frontend: Path):
+
+
     def _semver(s: str) -> bool:
         return bool(re.match(r"^\d+(?:\.\d+){1,3}$", (s or "").strip()))
 
@@ -662,17 +679,12 @@ def _build_frontend(src_frontend: Path, dest_frontend: Path):
     if not yarn_cmd:
         _ensure_yarn_installed()
         yarn_cmd = _pick_yarn_cmd()
-
     if not yarn_cmd:
-        raise RuntimeError(
+        raise RuntimeError("Unable to detect or install a valid Yarn. Try: apt-get install -y npm && npm i -g yarn.")
-            "Unable to detect or install a valid Yarn. "
-            "Try: apt-get install -y npm && npm i -g yarn."
-        )
 
     with step("Installing frontend dependencies (yarn)"):
         os.environ["NODE_ENV"] = "development"
         os.chdir(src_frontend)
-
         _prepare_sass(src_frontend)
 
         cache_dir = (run_out(yarn_cmd + ["cache", "dir"], check=False) or "").strip()
@@ -693,48 +705,6 @@ def _build_frontend(src_frontend: Path, dest_frontend: Path):
             shutil.copytree(src_frontend / "app-images", dest_frontend / "images", dirs_exist_ok=True)
 
 
-    def _ensure_yarn_installed():
-        if not shutil.which("npm"):
-            try:
-                apt_try_install(["npm"])
-            except Exception:
-                run(["apt-get", "update"], check=False)
-                run(["apt-get", "install", "-y", "npm"])
-        run(["npm", "install", "-g", "yarn"], check=False)
-
-    yarn_cmd = _pick_yarn_cmd()
-    if not yarn_cmd:
-        _ensure_yarn_installed()
-        yarn_cmd = _pick_yarn_cmd()
-
-    if not yarn_cmd:
-        raise RuntimeError(
-            "Unable to detect or install a valid Yarn. "
-            "Try: apt-get install -y npm && npm i -g yarn."
-        )
-
-    with step("Installing frontend dependencies (yarn)"):
-        os.environ["NODE_ENV"] = "development"
-        os.chdir(src_frontend)
-
-        cache_dir = (run_out(yarn_cmd + ["cache", "dir"], check=False) or "").strip()
-        if cache_dir and not Path(cache_dir).exists():
-            Path(cache_dir).mkdir(parents=True, exist_ok=True)
-
-        run(yarn_cmd + ["cache", "clean"], check=False)
-        run(yarn_cmd + ["install"])
-
-    with step("Building frontend (yarn build)"):
-        env = os.environ.copy()
-        env["NODE_OPTIONS"] = "--openssl-legacy-provider"
-        run(yarn_cmd + ["build"], env=env)
-
-    with step("Copying frontend artifacts"):
-        shutil.copytree(src_frontend / "dist", dest_frontend, dirs_exist_ok=True)
-        if (src_frontend / "app-images").exists():
-            shutil.copytree(src_frontend / "app-images", dest_frontend / "images", dirs_exist_ok=True)
-
-
 def patch_npm_backend_commands():
     candidates = [
         Path("/opt/npm/lib/utils.js"),