Package: calibre
Version: 4.99.4+dfsg+really4.17.0-1
Severity: normal

Dear Maintainer,

ebook-viewer crash for every ebook I try to open

$ ebook-viewer a.epub
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
Fatal Python error: PyEval_SaveThread: NULL tstate
Python runtime state: initialized

Current thread 0x00007f3ee047d740 (most recent call first):
File "/usr/lib/calibre/calibre/gui2/webengine.py", line 126 in _dispatch_messages
  File "/usr/lib/calibre/calibre/gui2/viewer/main.py", line 229 in main
  File "/usr/lib/calibre/calibre/gui_launch.py", line 81 in ebook_viewer
  File "/usr/bin/ebook-viewer", line 20 in <module>
Annullato

I have found this bug report in arch:
https://bugs.archlinux.org/task/66905

in this bug report the prolem is a python2 library, I have see that the corresponding python3 library has been updated today:
python3-pyqt5

but I cant try to install the previews version, elsewhere it will remove calibre and so I cannot test if this is the problem.

Let me know if you need more information or what I can do for try to understand the problem

Ciao
Davide

-- System Information:
Debian Release: bullseye/sid
  APT prefers testing-debug
  APT policy: (500, 'testing-debug'), (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.6.14-dp-20200530 (SMP w/4 CPU cores; PREEMPT)
Kernel taint flags: TAINT_UNSIGNED_MODULE
Locale: LANG=it_IT.utf8, LC_CTYPE=it_IT.utf8 (charmap=UTF-8), LANGUAGE=it_IT.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages calibre depends on:
ii  calibre-bin                      4.99.4+dfsg+really4.17.0-1+b1
ii  dpkg                             1.19.7
ii  fonts-liberation                 1:1.07.4-11
ii  imagemagick                      8:6.9.10.23+dfsg-2.1+b2
ii  imagemagick-6.q16 [imagemagick]  8:6.9.10.23+dfsg-2.1+b2
ii  libjpeg-turbo-progs              1:1.5.2-2+b1
ii  libjs-mathjax                    2.7.8+dfsg-1
ii  libjxr-tools                     1.1-6+b1
ii  optipng                          0.7.7-1+b1
ii  poppler-utils                    0.71.0-6
ii  python3                          3.8.2-3
ii  python3-apsw                     3.30.1-r1-1.1+b1
ii  python3-bs4                      4.9.1-1
ii  python3-chardet                  3.0.4-7
ii  python3-chm                      0.8.6-2+b1
ii  python3-css-parser               1.0.4-2
ii  python3-cssselect                1.1.0-2
ii  python3-cssutils                 1.0.2-3
ii  python3-dateutil                 2.8.1-4
ii  python3-dbus                     1.2.16-2
ii  python3-feedparser               5.2.1-2
ii  python3-html2text                2020.1.16-1
ii  python3-html5-parser             0.4.9-3+b1
ii  python3-html5lib                 1.0.1-3
ii  python3-lxml                     4.5.0-1.1
ii  python3-markdown                 3.2.2-1
ii  python3-mechanize                1:0.4.5-2
ii  python3-msgpack                  0.6.2-1+b1
ii  python3-netifaces                0.10.9-0.2+b1
ii  python3-pil                      7.0.0-4+b1
ii  python3-pkg-resources            46.1.3-1
ii  python3-pygments                 2.3.1+dfsg-3
ii  python3-pyparsing                2.4.7-1
ii  python3-pyqt5                    5.15.0+dfsg-1
ii  python3-pyqt5.qtsvg              5.15.0+dfsg-1
ii  python3-pyqt5.qtwebengine        5.14.0-2+b1
ii  python3-regex                    0.1.20190819-2+b1
ii  python3-routes                   2.4.1-2
ii  python3-zeroconf                 0.26.1-1
ii  xdg-utils                        1.1.3-2

Versions of packages calibre recommends:
ii  python3-dnspython  1.16.0-2
ii  udisks2            2.9.0-1

Versions of packages calibre suggests:
ii  python3-openssl   19.1.0-2
pn  python3-unrardll  <none>

-- debconf-show failed

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