QXcbConnection: Could not connect to display

[Maelp]

[my solution is at the end of the message]

Hi.
I am encountering the same problem as in this topic :

QXcbConnection: Could not connect to display 
Abandon

and I can't manage how to solve it. I read the proposed solution but first apparently, he had troubles when compiling, and he runs it on windows. I couldn't try it as I am working with Linux.

Here is the situation : I developped an application on Linux/Ubuntu (Ubuntu 14.04.3 LTS) that works fine. I want to deploy it on a server (Debian GNU/Linux 8 ) without installing Qt or compiling it.
I added all the required libraries into the folder pointed by LD_LIBRARY_PATH. Then I got a problem with xcb wich has been solved by adding the libqxcb to the folder pointed by QT_QPA_PLATFORM_PLUGIN_PATH.

Since then I have this error and I can't manage how to solve it. I copied all the plugins from from Qtrootdir/plugins/platforms/ to QT_QPA_PLATFORM_PLUGIN_PATH;
all the qml from Qtrootdir/qml into QML_IMPORT_PATH (and QML2_IMPORT_PATH (as I read this link ) and I can't manage to find anything else to do.

Would anyone have any idea?
Thanks :)

***Solution : ***
The problem was that I was trying to display a window when I actually had no monitor or anything.
So I used ssh -X in order to use my computer's display.

I hope this will help people in the future.

[A Former User]

@Maelp said:

I want to deploy it on a server

Are you sure your X server is up and running?

[Maelp]

Hi,

The problem was that I was trying to display a window when I actually had no monitor or anything.
So I used ssh -X in order to use my computer's display.

I hope this will help people in the future.

[Shidharth]

@Maelp @Wieland
I'm also having the same error when deploy the application.

How can I use ssh-X in Ubuntu 16.04? I'm newbie to Ubuntu, can you please provide the steps to overcome the error.

[Shidharth]

Resolved by setting the DISPLAY and XAUTHORITY Environment variables.