Fresh install 5.15: Could not load the Qt platform plugin "xcb"

poncho524

I installed 5.15 fresh. twice. on Linux. running a simple application gives me the error

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.

Aborted (core dumped)

what gives? Anyone else have this problem? I'm running Linux Mint 18.3.

poncho524

Found it...
libqxcb.so wanted libxcb-xinerama.so.0, which apparently i was missing.
installed it and all is well.
frustrating.

hskoglund

Thanks for the tip! Just upgraded Qt from 5.14 to 5.15 on my Ubuntu 20.04 and got stuck with the same error. Easily fixed with a

sudo apt install libxcb-xinerama0

huynhthien

@hskoglund thank you so much, it work for me!

PuddleGlum_1

@hskoglund

Which resulted in

$ sudo apt install libxcb-xinerama0
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package libxcb-xinerama0 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'libxcb-xinerama0' has no installation candidate

Attempting to simply run Calibre after wiping my hard drive and reinstalling Ubuntu 20.04.3

mrjj

@PuddleGlum_1

sudo apt update
sudo apt install libxcb-xinerama0

works for me ?

I saw a post where poster also have to install
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-icccm4
sudo apt install -y -q build-essential libgl1-mesa-dev