breaking the one-liner into logical parts like the one below allows me to move past the first stage

wget -qO - https://www.mongodb.org/static/pgp/server-4.4.asc | apt-key add - 

curl -sL https://deb.nodesource.com/setup_lts.x \
| bash - echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu $(lsb_release -sc)/mongodb-org/4.4 multiverse" \
| sudo tee /etc/apt/sources.list.d/mongodb-org-4.4.list
 
apt-get update 
apt-get install -y mongodb-org nodejs -y

hey @julian
It's the first line, error ...

root@nodebb:~# wget -qO - https://www.mongodb.org/static/pgp/server-4.4.asc | sudo apt-key add - curl -sL https://deb.nodesource.com/setup_lts.x | sudo -E bash - echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu $(lsb_release -sc)/mongodb-org/4.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.4.list apt-get update apt-get install -y mongodb-org nodejs -y
tee: invalid option -- 'y'
Try 'tee --help' for more information.
/bin/echo: /bin/echo: cannot execute binary file
Warning: apt-key output should not be parsed (stdout is not a terminal)
gpg: can't open 'curl': No such file or directory
gpg: can't open '-sL': No such file or directory
gpg: can't open 'https://deb.nodesource.com/setup_lts.x': No such file or directory

@julian said in Tutorial: Install NodeBB on DigitalOcean/Ubuntu 20.04:

@ddos you didn't install node.js, that's necessary for installation of NodeBB. (That's step 4 by the way)

Thanks @julian

I did install node.js as outlined by the tutorial, now I'm presented with ....

npm ERR! typeerror Error: Missing required argument #1
npm ERR! typeerror     at andLogAndFinish (/usr/share/npm/lib/fetch-package-metadata.js:31:3)
npm ERR! typeerror     at fetchPackageMetadata (/usr/share/npm/lib/fetch-package-metadata.js:51:22)
npm ERR! typeerror     at resolveWithNewModule (/usr/share/npm/lib/install/deps.js:456:12)
npm ERR! typeerror     at /usr/share/npm/lib/install/deps.js:457:7
npm ERR! typeerror     at /usr/share/npm/node_modules/iferr/index.js:13:50
npm ERR! typeerror     at /usr/share/npm/lib/fetch-package-metadata.js:37:12
npm ERR! typeerror     at addRequestedAndFinish (/usr/share/npm/lib/fetch-package-metadata.js:82:5)
npm ERR! typeerror     at returnAndAddMetadata (/usr/share/npm/lib/fetch-package-metadata.js:117:7)
npm ERR! typeerror     at pickVersionFromRegistryDocument (/usr/share/npm/lib/fetch-package-metadata.js:134:20)
npm ERR! typeerror     at /usr/share/npm/node_modules/iferr/index.js:13:50
npm ERR! typeerror This is an error with npm itself. Please report this error at:
npm ERR! typeerror     <http://github.com/npm/npm/issues>
WARN engine [email protected]: wanted: {"node":">=12.22.0"} (current: {"node":"8.10.0","npm":"3.5.2"})

npm ERR! Please include the following file with any support request:
npm ERR!     /root/nodebb/npm-debug.log
Error installing dependencies!
message: Command failed: npm install --omit=dev
stdout: null
stderr: null
/root/nodebb/src/cli/index.js:63
                throw e;
                ^

Error: Command failed: npm install --omit=dev
    at checkExecSyncError (child_process.js:601:13)
    at Object.execSync (child_process.js:641:13)
    at Object.pkgInstall.installAll (/root/nodebb/src/cli/package-install.js:129:9)
    at Object.<anonymous> (/root/nodebb/src/cli/index.js:20:19)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Module.require (module.js:596:17)

I tried this installation and it did not work.

root@nodebb:~/nodebb# ./nodebb setup
Dependencies outdated or not yet installed.
Installing them now...

/bin/sh: 1: npm: not found
Error installing dependencies!
message: Command failed: npm install --omit=dev
stdout: null
stderr: null
/root/nodebb/src/cli/package-install.js:138
                throw e;
                ^

Error: Command failed: npm install --omit=dev
    at checkExecSyncError (child_process.js:601:13)
    at Object.execSync (child_process.js:641:13)
    at Object.pkgInstall.installAll (/root/nodebb/src/cli/package-install.js:129:9)
    at Object.<anonymous> (/root/nodebb/src/cli/index.js:58:18)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Module.require (module.js:596:17)

Hey Guys

Can someone kindly point me to installation documentation that works with ubuntu 20.04 please?