Cannot install nvm, npm or nodejs
Sebastian Wright 
I'm having trouble installing nodejs and npm on my newly installed WSL2. I've set the WSL up according to the instructions from Microsoft and downloaded the Ubuntu program from Windows Store. I tried running both sudo apt-get install npm and sudo apt-get install nodejs but the answer I get is just "Unable to locate package". I googled a little and found that I could install it via nvm using cURL (curl -v -o- | bash), but cURL manages to set up the TCP connection and then promptly just runs without downloading anything, just running a timer on how long it's been going.
What am I doing wrong? My first thought was that I don't have an internet connection, but it should be running on my Windows connection, and as I say, the TCP is connected correctly because I get no connection errors. Any help on this matter is appreciated!
EDIT: I tried running sudo apt update and I get connection errors to archive.ubuntu.com and security.ubuntu.com which I presume is the servers it's supposed to download the packages from. I get no other error messages except for the servers not answering and the connection timing out, however I can ping both servers and get an answer very quickly. Forcing it to use IPv4 instead of IPv6 which was suggested on another site did not work either.
EDIT2: This is a corporate computer (which I am admin on) on my private network, but I will look into it to see if there are any specific settings I have to enable to give my Ubuntu terminal access or even if I have to be on the corporate network.
81 Answer
The answer was a simple one: my firewall was blocking the connection somehow (my guess is that it blocked all outgoing TCP connections that weren't whitelisted). If you have a similar problem it might be a good idea to try to turn off the firewall for a couple of minutes while you install the things you want, or to find a way to let your WSL through if you can't turn it off.
