Unable to open display ':0' when launching an app on Debian 12
 

I recently installed CasaOS for a minecraft server, and recently had a thought that i could install Teamviewer on my server computer thinking i could WOL my main PC through there but my problem is that when i try to open teamviewer it shows me this message:

Init...
xprop: unable to open display ':0'
CheckCPU: SSE2 support: yes
Checking setup...
Launching TeamViewer ...
Launching TeamViewer GUI ...
Aborted

I tried following this guide: "https://linuxconfig.org/fixing-the-cannot-open-display-error-on-linux", but it didn't work, any advice?

Does your server have a desktop installed?

How are you trying to launch teamviewer?

When you log into a system running X-Windows, your system needs to set a DISPLAY environment variable to point to your display and keyboard. ssh does this when you give the -X or -Y options. Logging in from the local keyboard and monitor usually sets this to :0. You can check in a terminal with the command: You can check if X is running with the command

1. If dy desktop you mean visual interface then no, only terminal on the server itself and i interact trough CasaOS

2. Through terminal by writing teamviewer

when i write

i get :0

and

outputs nothing

TeamViewer is a remote desktop application and without a desktop it is not going to run. An alternative would be to use ssh and then run etherwake or other utilities that send WOL magic packets.

thanks for pointing out that it can't run without desktop, i had problems with teamviewer after getting a desktop installed but i worked it out with anydesk in the end, thanks