Address comments

Author: minggangw

lib/utils.js

@@ -27,7 +27,7 @@ function detectUbuntuCodename() {
     const osRelease = fs.readFileSync('/etc/os-release', 'utf8');
     const match = osRelease.match(/^VERSION_CODENAME=(.*)$/m);
     return match ? match[1].trim() : null;
-  } catch (e) {
+  } catch {
     return null;
   }
 }