Angular告诉我，我的Node.js版本对于我的Angular版本而言太旧了：
服务
You are running version v4.2.6 of Node.js, which is not supported by Angular CLI v6.
The official Node.js version that is supported is 8.9 and greater.
Please visit https://nodejs.org/en/ to find instructions on how to update Node.js.
我将Node.js版本更新为最新版本：
节点--version
v11.9.0
npm --version
6.7.0
nvm --version
0.34.0
即使在更新Node之后，它仍然会给我警告。仅当我在命令前使用 sudo 时，才会发生此问题。
编辑1
根据要求：
ng --version
_ _ ____ _ ___
/ \ _ __ __ _ _ _| | __ _ _ __ / ___| | |_ _|
/ △ \ | '_ \ / _` | | | | |/ _` | '__| | | | | | |
/ ___ \| | | | (_| | |_| | | (_| | | | |___| |___ | |
/_/ \_\_| |_|\__, |\__,_|_|\__,_|_| \____|_____|___|
|___/
Angular CLI: 7.1.4
Node: 11.9.0
OS: linux x64
Angular: 7.1.4
... animations, cli, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router
Package Version
-----------------------------------------------------------
@angular-devkit/architect 0.11.4
@angular-devkit/build-angular 0.11.4
@angular-devkit/build-optimizer 0.11.4
@angular-devkit/build-webpack 0.11.4
@angular-devkit/core 7.1.4
@angular-devkit/schematics 7.1.4
@ngtools/webpack 7.1.4
@schematics/angular 7.1.4
@schematics/update 0.11.4
rxjs 6.3.3
typescript 3.1.6
webpack 4.23.1