ubuntu 20.04安装nodejs

dependencies - Npm can't find module "semver" error in Ubuntu 19.04 - Ask Ubuntu 

sudo rm -rf /usr/local/bin/npm /usr/local/share/man/man1/node* ~/.npm
sudo rm -rf /usr/local/lib/node*
sudo rm -rf /usr/local/bin/node*
sudo rm -rf /usr/local/include/node*

sudo apt-get purge nodejs npm
sudo apt autoremove

Download the latest tar.xz NodeJS file from Download | Node.js

tar -xf node-v#.#.#-linux-x64.tar.xz
sudo mv node-v#.#.#-linux-x64/bin/* /usr/local/bin/
sudo mv node-v#.#.#-linux-x64/lib/node_modules/ /usr/local/lib/

Where #.#.# is the version you downloaded.

Verify installation using

node -v
npm -v