npm

 sudo apt-get remove nodejs

sudo apt-get remove npm

Then go to /etc/apt/sources.list.d and remove any node list if you have. Then do a

sudo apt-get update

Check for any .npm or .node folder in your home folder and delete those.

If you type

install node

nvm install 12.14.0

error ionic

npm i paulstelzer-ionic-angular-toolkit