Calibre starting problem after update

[edeniz]

I've just downloaded the newest update of calibre, but suddenly it won't start up. As in, it's not even listed in the system monitor process list. It just won't start up without giving out any messages.

I thought I'd try running it from the terminal, so as to get error messages that way, but this is the message I get:

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)

Yes, I get that apparently Qt is to blame. But still I'm not sure what exactly the problem is, considering literally five minutes earlier it didn't exist?

[DNSB]

Originally Posted by edeniz

I've just downloaded the newest update of calibre, but suddenly it won't start up. As in, it's not even listed in the system monitor process list. It just won't start up without giving out any messages.

I thought I'd try running it from the terminal, so as to get error messages that way, but this is the message I get:

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)

Yes, I get that apparently Qt is to blame. But still I'm not sure what exactly the problem is, considering literally five minutes earlier it didn't exist?

To quote from Kovid Goyal's response to someone who had a very similar error.

Originally Posted by Immelmann67

Hi Kovid,

I'm running Zorin Linux, and have been on Calibre 4.x. I missed the jump to 5.0, but when I upgraded to 5.0.1 and tried running it, I got the following error message:

I tried re-installing, but had no joy- I still got the same error message.

Any ideas?

Originally Posted by kovidgoyal

@Immelman you are missing one of Qt's dependencies, probably libxcb-xinerama0

[edeniz]

, DNSB!

Somehow I didn't see that thread, or I would have tried that first before I posted mine. Oops.

It did actually work, so no starting problems anymore. Yay!

But I'm still left baffled. Why now so suddenly? Did calibre not require that dependency previously or something? Because presumably, it was missing on my PC all along anyway, and yet calibre still worked?

[DNSB]

Originally Posted by edeniz

, DNSB!

Somehow I didn't see that thread, or I would have tried that first before I posted mine. Oops.

It did actually work, so no starting problems anymore. Yay!

But I'm still left baffled. Why now so suddenly? Did calibre not require that dependency previously or something? Because presumably, it was missing on my PC all along anyway, and yet calibre still worked?

I seem to remember that what Kovid said is that the version of QT used by calibre has been updated and some of the new prerequisites are not installed by default.

[gbm]

Originally Posted by edeniz

, DNSB!

Somehow I didn't see that thread, or I would have tried that first before I posted mine. Oops.

It did actually work, so no starting problems anymore. Yay!

But I'm still left baffled. Why now so suddenly? Did calibre not require that dependency previously or something? Because presumably, it was missing on my PC all along anyway, and yet calibre still worked?

I would guess that the linux os you are using is past end of life and is no longer getting updates. My recommendation is to go to DistroWatch and check.


if it is past end of life then upgrade to the latest version, the improvements in the Mesa video driver are well worth it.

bernie

[edeniz]

kindly for your replies, DNSB and bernie!

Originally Posted by gbm

I would guess that the linux os you are using is past end of life and is no longer getting updates. My recommendation is to go to DistroWatch and check.


if it is past end of life then upgrade to the latest version, the improvements in the Mesa video driver are well worth it.

bernie

Yeah, you have a point there. That might well be the case. I have been dragging my feet about updating from the 16.04 distro I currently have, simply because while I'm at it, I'd feel obligated to either clean up and organise better my harddisk or replace it with another one and I'm too lazy to do so at the moment. I should probably stop procrastinating on that point.

[bunyip]

Same error
Ubuntu 20.4

Did the suggestion from another post to install

sudo apt install libxkbcommon-x11-0
did reinstall of calibre
did not work

tried to do calibre uninstall got

calibre uninstall
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
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)