I have ubuntu machine with node version v12.22.7. I've installed newer version and set to use it by NVM:
ubuntu@ip-122-221-123-233:~$ nvm ls
-> v13.14.0
system
default -> 13.14.0 (-> v13.14.0)
iojs -> N/A (default)
unstable -> N/A (default)
node -> stable (-> v13.14.0) (default)
stable -> 13.14 (-> v13.14.0) (default)
lts/* -> lts/gallium (-> N/A)
lts/argon -> v4.9.1 (-> N/A)
lts/boron -> v6.17.1 (-> N/A)
lts/carbon -> v8.17.0 (-> N/A)
lts/dubnium -> v10.24.1 (-> N/A)
lts/erbium -> v12.22.7 (-> N/A)
lts/fermium -> v14.18.1 (-> N/A)
lts/gallium -> v16.13.0 (-> N/A)
But after log-out and login again node version becomes previus:
ubuntu@ip-122-221-123-233:~$ node -v
v12.22.7