[nbi]

Originally Posted by kovidgoyal

Uninstall your distro calibre and install the official binaries from https://calibre-ebook.com/download_linux

Thank you, I encountered the same problem and this fixed it.

However there are now other showstopper problems:

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1. If I run as root I get:

Creating PDF Output...
Converting input as a text based book...
[3252131:3252131:0614/111726.662364:ERROR:zygote_host_impl_linux.cc(89)] Running as root without --no-sandbox is not supported. See https://crbug.com/638180.

2. If I run as a non-root user I get:

Authorization required, but no authorization protocol specified
qt.qpa.xcb: could not connect to display :0.0
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.
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Reinstalling obviously will not fix this problem. Is there anything I can do to get calibre running on Debian? Thanks.