This application failed to start because it could not find or load the Qt platform plugin "xcb".

[DylanMS]

Versions

• Candle version: 1.1.7

PC info

• OS: Linux Ubuntu Studio 22.10

Describe the bug After runing in console showing error ./Candle This application failed to start because it could not find or load the Qt platform plugin "xcb".

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, xcb.

Reinstalling the application may fix this problem. Neúspěšně ukončen (SIGABRT) (core dumped [obraz paměti uložen])

also tryed sudo sudo ./Candle [sudo] heslo pro dylan: ./Candle: error while loading shared libraries: libQt5OpenGL.so.5: cannot open shared object file: No such file or directory

Additional context Tryed everithing. IM DESPERATE

[103131]

Hi everyone, I don't have a solution. But I have the same problem. Do someone have a solution? Thanks a lot for any advice.

[spjt]

I got it to work by building the application from source. There don't seem to be any build instructions on the readme, this is an approximation of what I did while wading through trying to get it to work:

apt install cmake libqt5serialport5-dev xcb xcb-proto cd Candle cmake make ./Candle

[103131]

Thanks a lot spjt. I'll give it a try about what you explain. Thanks a lot for answering me. Have a nice day.

[Barb1211]

apt install cmake libqt5serialport5-dev xcb xcb-proto cd Candle cmake make ./Candle

how do I do this. when i try to start program the error message says Not Connected. I have followed all startup instructions. What did I miss?

[stephan57160]

Had the same troubles This application failed to start because it could not find or load the Qt platform plugin "xcb".

On my side (Ubuntu 22.04), the problem comes from libraries coming with the .tar.gz: libs/libQt5* They are probably generated for a different distro, where xcb is not at the same place. Would be better to remove them from the tarball and improve the documentation to install Candle on Linux...

So, after I removed Qt5 libraries (and only Qt5 libs), I had to install a few things for i386. Then I managed to have Candle working with something like below:

$ cd Candle
$ rm -rf libs/libQt5*
$ sudo apt install libqt5serialport5-dev:i386
$ # Add other required libs, if needed, but do not forget the ':i386' !
$ ./Candle

To rebuild Candle, my method is taken from QT documentations:

$ cd Candle/src
$ qmake
$ make

Like this, you rebuild according to your PC capabilities (32 or 64 bits).

I still need to check if I still have the "Not Connected" problem, but too late to check that now.

[stephan57160]

Ubuntu 22.04:

Check that /dev/ttyUSB0 is present: ``` $ ~/git/Candle$ ll /dev/ttyUSB0 crw-rw---- 1 root dialout 188, 0 May 3 10:52 /dev/ttyUSB0 $ ~/git/Candle$ ``` If your user is not in group `dialout`, Candle will fail to open the device. To fix this: ``` $ usermod -a -G dialout $ ``` Now, disconnect from your Gnome session or reboot. If you reboot, make sure to unplug and replug the device. At least, the above works for me.

[pogo555]

Thankyou @stephan57160. Deleting the libQt5 and installing libqt5serialport5-dev:i386 solved my problem.

For those following, the program simply refused to start when double clicked. Running it in a terminal returned command not found "Candle".