I am following https://github.com/nodesource/distributions to install Nodejs v11.x on Debian. After following the two instructions, Nodejs seems to be installed fine and nodejs -v returns v4.8.2.
But npm doesn't seem to have been installed. whereis npm returns nothing and I am fairly certain there is no npm installed on my disk.
I have pasted the console log after the command curl -sL https://deb.nodesource.com/setup_11.x | bash - below:
+ apt-get update
Hit:1 http://download.virtualbox.org/virtualbox/debian stretch InRelease
Get:2 http://ppa.launchpad.net/freecad-maintainers/freecad-stable/ubuntu cosmic InRelease [15.4 kB]
Hit:3 http://security.debian.org/debian-security stretch/updates InRelease
Ign:2 http://ppa.launchpad.net/freecad-maintainers/freecad-stable/ubuntu cosmic InRelease
Hit:4 http://deb.debian.org/debian stretch-backports InRelease
Ign:5 http://deb.debian.org/debian stretch InRelease
Ign:6 http://ppa.launchpad.net/webupd8team/java/ubuntu disco InRelease
Hit:7 http://deb.debian.org/debian stretch Release
Ign:9 http://ppa.launchpad.net/webupd8team/java/ubuntu disco Release
Hit:10 https://download.sublimetext.com apt/stable/ InRelease
Ign:11 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main i386 Packages
Ign:12 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main amd64 Packages
Ign:13 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main all Packages
Ign:14 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main Translation-en_US
Ign:15 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main Translation-en
Ign:16 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main amd64 DEP-11 Metadata
Ign:17 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main all DEP-11 Metadata
Ign:11 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main i386 Packages
Ign:12 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main amd64 Packages
Ign:13 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main all Packages
Ign:14 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main Translation-en_US
Ign:15 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main Translation-en
Ign:16 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main amd64 DEP-11 Metadata
Ign:17 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main all DEP-11 Metadata
Ign:11 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main i386 Packages
Ign:12 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main amd64 Packages
Ign:13 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main all Packages
Ign:14 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main Translation-en_US
Ign:15 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main Translation-en
Ign:16 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main amd64 DEP-11 Metadata
Ign:17 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main all DEP-11 Metadata
Ign:11 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main i386 Packages
Ign:12 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main amd64 Packages
Ign:13 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main all Packages
Ign:14 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main Translation-en_US
Ign:15 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main Translation-en
Ign:16 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main amd64 DEP-11 Metadata
Ign:17 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main all DEP-11 Metadata
Ign:11 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main i386 Packages
Ign:12 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main amd64 Packages
Ign:13 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main all Packages
Ign:14 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main Translation-en_US
Ign:15 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main Translation-en
Ign:16 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main amd64 DEP-11 Metadata
Ign:17 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main all DEP-11 Metadata
Err:11 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main i386 Packages
404 Not Found
Ign:12 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main amd64 Packages
Ign:13 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main all Packages
Ign:14 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main Translation-en_US
Ign:15 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main Translation-en
Ign:16 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main amd64 DEP-11 Metadata
Ign:17 http://ppa.launchpad.net/webupd8team/java/ubuntu disco/main all DEP-11 Metadata
Fetched 15.4 kB in 16s (929 B/s)
Reading package lists... Done
W: GPG error: http://ppa.launchpad.net/freecad-maintainers/freecad-stable/ubuntu cosmic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 005EAE8119BB5BCA
W: The repository 'http://ppa.launchpad.net/freecad-maintainers/freecad-stable/ubuntu cosmic InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://ppa.launchpad.net/webupd8team/java/ubuntu disco Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://ppa.launchpad.net/webupd8team/java/ubuntu/dists/disco/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
Error executing command, exiting
My guess is that the installer script stops midway during the process as apt-get is throwing an error. However even if that were the case, I have no idea how to tackle this problem. I don't want to remove the repositories for freecad and java to get apt to quit positively.
If the answer is related to apt-get and is off-topic on this forum, maybe it can be migrated to askubuntu?
Trying to fix the repository issues gives weird python errors, it might have to do with me having both python 2.7 and 3 installed in my system but I don't know for sure.
What I ended up doing is just removing the problematic repositories from /etc/apt/sources.list.d temporarily and then running the curl script again. This makes the script run without any errors and afterwards, the command apt install -y nodejs installs the correct version along with npm.
The problem, it seems, was that debian's default repository also has a nodejs pacakge without npm. And due to the apt-get update error, the install script quit prematurely. Fixing that error did the job.