Hardcoded the version of NWjs to 0.55.0 in the build scripts, as the latest version cause some problems.

pkg/linux/build-functions.sh

@@ -125,7 +125,10 @@ _build_runtime() {
     # YARN END
 
     # WGET:
-    NW_VERSION=$(yarn info nw | grep latest | awk -F "'" '{ print $2}')
+    # Comment out the below line as the latest version (0.57.0) having some
+    # problem, so for the time being hardcoded the version to 0.55.0
+    # NW_VERSION=$(yarn info nw | grep latest | awk -F "'" '{ print $2}')
+    NW_VERSION="0.55.0"
     pushd "${BUILDROOT}" > /dev/null
         while true;do
             wget https://dl.nwjs.io/v${NW_VERSION}/nwjs-v${NW_VERSION}-linux-x64.tar.gz && break