Ubuntu 20.04.02 LTS: QtCreator won't run - load xcb plugin error

idlefrog

Ubuntu 20.04.02 LTS installation Qt6
I followed the instructions on: https://doc.qt.io/qt-6/linux.html
Ran the online-installer for Qt.
Clicking Finish to run QtCreator, I get the error:

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.

What should I do?

raven-worx

@idlefrog said in Ubuntu 20.04.02 LTS: QtCreator won't run - load xcb plugin error:

What should I do?

this error has been answered alot of times in this forum

idlefrog

Yes, there are many posts about the xcb plugin. It clearly is an issue in various scenarios.
Although non seem to be based on a basic installation on a clean Ubuntu installation.
It's a fresh Ubuntu 20.04 LTS VM. I've not had this problem before.

SGaist

Hi,

As all the other threads mentioned, did you start Qt Creator on the command line with the QT_DEBUG_PLUGINS environment variable set to 1 ?

JoeCFD

@idlefrog said in Ubuntu 20.04.02 LTS: QtCreator won't run - load xcb plugin error:

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.

https://forum.qt.io/topic/93247/qt-qpa-plugin-could-not-load-the-qt-platform-plugin-xcb-in-even-though-it-was-found/13
old story. It is likely the libxcb-xinerama is not installed.

idlefrog

@SGaist @JoeCFD Thanks guys... the QT_DEBUG_PLUGINS was the nudge I needed.
Here's what I had to install to get QtCreator to run on Ubuntu LTS 20.04

sudo apt update -q
sudo apt install -y -q build-essential libgl1-mesa-dev

sudo apt install -y -q libxkbcommon-x11-0
sudo apt install -y -q libxcb-image0
sudo apt install -y -q libxcb-keysyms1
sudo apt install -y -q libxcb-render-util0
sudo apt install -y -q libxcb-xinerama0
sudo apt install -y -q libxcb-icccm4

Now I can relax again!