Try permissions option

src/freedombone-app-scuttlebot

 
     cat <<EOF > "$rootdir/usr/bin/install_scuttlebot"
 #!/bin/bash
-chown -R $(whoami):$(whoami) $(npm config get prefix)/{lib/node_modules,bin,share}
-chown -R $(whoami):$(whoami) ~/.npm
-if ! npm install --arch=$NPM_ARCH -g scuttlebot@${SCUTTLEBOT_VERSION}; then
-    exit 2
+if ! npm install --unsafe-perm --verbose --arch=$NPM_ARCH -g scuttlebot@${SCUTTLEBOT_VERSION}; then
+    exit 1
 fi
 if ! npm install --arch=$NPM_ARCH -g git-ssb; then
-    exit 3
+    exit 2
 fi
 if ! npm install --arch=$NPM_ARCH -g git-remote-ssb; then
-    exit 4
+    exit 3
 fi
 EOF
     chroot "$rootdir" /bin/chmod +x /usr/bin/install_scuttlebot