How to uninstall obsolete version of node.js from Ubuntu?

Question

I have two versions of node.js installed on my Ubuntu server(Ubuntu 14.04, node.js v0.12.4 and v6.9.2), the version 0.12.4 was installed through downloaded archive file and the version 6.9.2 was installed through apt-get by following this . However whenever I run npm test command for my project, it can't find version 6.9.2 node.js(which needs node version >= 6.xx), what should I do to uninstall the obsolete version 0.12.4 node.js?

Answer 1

I believe nvm could be the solution. BTW, node.js LTS version is currently 6.9.1