mjhjmtu

I run Debian 9.3. I went to the NodeJS website to see how to install NodeJS v9.X on my machine and ran the code provided.

curl -sL https://deb.nodesource.com/setup_9.x | sudo -E bash -
sudo apt-get install -y nodejs

But the terminal spit out this message:

Reading package lists... Done
Building dependency tree 
Reading state information... Done
nodejs is already the newest version (4.8.2~dfsg-1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

My machine is stuck with NodeJS v4.8.2 and NPM v1.4.21.

How do I upgrade to the latest NodeJS and NPM?

UPDATE

I followed @GAD3R's instructions. It still installs v4.8.2. Here's what I get after running GAD3R's commands then running sudo apt install nodejs.

Reading package lists... Done
Building dependency tree 
Reading state information... Done
The following additional packages will be installed:
 libuv1
The following NEW packages will be installed:
 libuv1 nodejs
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/3,524 kB of archives.
After this operation, 14.5 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Selecting previously unselected package libuv1:amd64.
(Reading database ... 141225 files and directories currently installed.)
Preparing to unpack .../libuv1_1.9.1-3_amd64.deb ...
Unpacking libuv1:amd64 (1.9.1-3) ...
Selecting previously unselected package nodejs.
Preparing to unpack .../nodejs_4.8.2~dfsg-1_amd64.deb ...
Unpacking nodejs (4.8.2~dfsg-1) ...
Setting up libuv1:amd64 (1.9.1-3) ...
Processing triggers for libc-bin (2.24-11+deb9u1) ...
Processing triggers for man-db (2.7.6.1-2) ...
Setting up nodejs (4.8.2~dfsg-1) ...
update-alternatives: using /usr/bin/nodejs to provide /usr/bin/js (js) in auto mode

When I run update-alternatives --config nodejs, the terminal prints update-alternatives: error: no alternatives for nodejs

==

When I run apt-cache policy nodejs, I get this...

nodejs:
 Installed: 4.8.2~dfsg-1
 Candidate: 4.8.2~dfsg-1
 Version table:
 9.3.0-1nodesource1 500
 500 https://deb.nodesource.com/node_9.x stretch/main amd64 Packages
 8.9.3~dfsg-2 1
 1 http://ftp.us.debian.org/debian experimental/main amd64 Packages
 6.12.0~dfsg-2 500
 500 http://ftp.us.debian.org/debian unstable/main amd64 Packages
 *** 4.8.2~dfsg-1 990
 990 http://ftp.us.debian.org/debian stretch/main amd64 Packages
 100 /var/lib/dpkg/status

==

I ran sudo /etc/apt/preferences, which did not exist until now, and wrote this in it:

Package: *
Pin: release n=experimental
Pin-Priority: 100

Package: *
Pin: release n=unstable
Pin-Priority: 100

Package: *
Pin: release n=stable
Pin-Priority: 500

I re-ran the commands from GAD3R's post, but still Debian installed v4.8.2 of nodejs package.

The 4.8.2 version is installed through apt from the main repo.

run:

apt purge nodejs
apt install lsb-release
apt install -y nodejs

Verify the installed nodjs version:

node --version
v9.3.0

The npm version:

npm --version
5.5.1

The problem come from the pin priority , pin the stable release to 500

Package: *
Pin: release n=experimental 
Pin-Priority: 100

Unstable:

Package: *
Pin: release n=unstable
Pin-Priority: 100

And the stable:

Package: *
Pin: release n=stable
Pin-Priority: 500