sudo sh /usr/lib/triggercmdagent/resources/app/src/installdaemon.sh

https://github.com/rvmey/TRIGGERcmd-Agent/blob/master/ubuntupackage.json#L52

Thanks for your reply!

System is an Ubuntu 18.04.5 LTS (bionic) without X-Windows

Anyway, I finally managed to make it work. Issue was dependencies:

apt install npm

solved the problem

Perhaps, including npm as a dependency within .deb package could solve potential future issues (currently, only nodejs is a dependency):

daniel@servidor:~$ sudo apt-cache depends triggercmdagent
triggercmdagent
  Depende: nodejs

Thanks!
Daniel

I have followed the instructions in a headless Ubuntu, getting some errors:

dpkg: error al procesar el paquete triggercmdagent (--install):
installed triggercmdagent package post-installation script subprocess returned error exit status 127

Triggercmd is installed but now, every time I try to apt upgrade it tries to reinstall triggercmd...

Is this the normal behaviour?

ps -ef | grep triggercmdagent

Question for you: Does triggercmd run the script as root, or as the user with elevated privileges via sudo?

root@fox:~/TRIGGERcmd-Agent# npm install
npm WARN deprecated chokidar@1.7.0: Chokidar 2 will break on node v14+. Upgrade                                   to chokidar 3 with 15x less dependencies.
npm WARN deprecated request@2.88.2: request has been deprecated, see https://git                                  hub.com/request/request/issues/3142
npm WARN deprecated posix-argv-parser@2.0.0: No longer maintained
npm WARN deprecated gulp-util@2.2.20: gulp-util is deprecated - replace it, foll                                  owing the guidelines at https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5
npm WARN deprecated gulp-util@3.0.8: gulp-util is deprecated - replace it, follo                                  wing the guidelines at https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5
npm WARN deprecated react-tools@0.13.3: react-tools is deprecated. For more info                                  rmation, visit https://fb.me/react-tools-deprecated
npm WARN deprecated fsevents@1.2.13: fsevents 1 will break on node v14+ and coul                                  d be using insecure binaries. Upgrade to fsevents 2.
npm WARN deprecated har-validator@5.1.5: this library is no longer supported
npm WARN deprecated chokidar@2.1.8: Chokidar 2 will break on node v14+. Upgrade                                   to chokidar 3 with 15x less dependencies.
npm WARN deprecated core-js@1.2.7: core-js@<3 is no longer maintained and not re                                  commended for usage due to the number of issues. Please, upgrade your dependenci                                  es to the actual version of core-js@3.
npm WARN deprecated buffer@2.1.13: This version of 'buffer' is out-of-date. You                                   must update to v2.8.3 or newer
npm WARN deprecated circular-json@0.3.3: CircularJSON is in maintenance only, fl                                  atted is its successor.
npm WARN deprecated core-js@2.6.11: core-js@<3 is no longer maintained and not r                                  ecommended for usage due to the number of issues. Please, upgrade your dependenc                                  ies to the actual version of core-js@3.
npm WARN deprecated urix@0.1.0: Please see https://github.com/lydell/urix#deprec                                  ated
npm WARN deprecated minimatch@0.3.0: Please update to minimatch 3.0.2 or higher                                   to avoid a RegExp DoS issue
npm WARN deprecated resolve-url@0.2.1: https://github.com/lydell/resolve-url#dep                                  recated
npm ERR! code EBADPLATFORM
npm ERR! notsup Unsupported platform for node-windows@0.1.14: wanted {"os":"win3                                  2","arch":"any"} (current: {"os":"linux","arch":"x64"})
npm ERR! notsup Valid OS:    win32
npm ERR! notsup Valid Arch:  any
npm ERR! notsup Actual OS:   linux
npm ERR! notsup Actual Arch: x64

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2020-10-23T21_32_13_991Z-debug.log
root@fox:~/TRIGGERcmd-Agent#

In the meantime, you could disable X-Windows at boot.

EDIT: @pirates, I reproduced the issue. I had a non-GUI, no X-Windows Ubuntu 20 VM, then installed the agent and it installed X-Windows. I'll get back to you soon because there should be a way to run the agent as a background service without X-Windows, like you can on a Raspberry Pi.

EDIT2: @pirates, this procedure worked for me to install the background agent without X-Windows:

sudo su -
git clone https://github.com/rvmey/TRIGGERcmd-Agent.git
cp ubuntupackage.json package.json
apt install -y npm
cd /root/TRIGGERcmd-Agent
npm install
node /root/TRIGGERcmd-Agent/src/agent.js --console
  (enter your token, then press CTRL-C to exit the foreground agent)
/bin/sh /root/TRIGGERcmd-Agent/src/daemonmgr.sh --add /root/.TRIGGERcmdData
systemctl enable triggercmdagent
systemctl status triggercmdagent

I copied these instructions to a new article here.

If that's the case, I'd like to try to reproduce that. What Linux are you using?

sudo su -

Run this:

node /usr/lib/triggercmdagent/resources/app/src/agent.js --console

It should prompt for your token, then start running. If it does, CTRL-C, then restart your triggercmdagent daemon with this command:

systemctl restart triggercmdagent

You can also watch the full log for the agent in another window with:

journalctl -u triggercmdagent -n 100 -f

Please send me any errors you see.

https://imgur.com/QHDUV8q.

And it was server when I installed base system for VM, but after all this command, it turn to GUI and can't open terminal anymore.