[flatpak] Fails to start in Ubuntu Unity with "Invalid tesseract version"

[archisman-panigrahi]

Here is the error message. I am running Ubuntu Unity 22.10.

$ flatpak run com.github.dynobo.normcap 
ERROR: ld.so: object 'libgtk3-nocsd.so.0' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
Gtk-Message: 18:33:58.284: Failed to load module "xapp-gtk3-module"
Gtk-Message: 18:33:58.284: Failed to load module "unity-gtk-module"
Gtk-Message: 18:33:58.345: Failed to load module "canberra-gtk-module"
Gtk-Message: 18:33:58.345: Failed to load module "canberra-gtk-module"
18:33:58 - CRITICAL - normcap.gui.utils:160 - Uncaught exception! Quitting NormCap!
18:33:58 - WARNING - normcap.screengrab.utils:92 - Exception when trying to get gnome version from xml 

System:

{  'cli_args': '/app/bin/normcap',
   'config_directory': PosixPath('/home/REDACTED/.var/app/com.github.dynobo.normcap/config/normcap'),
   'desktop_environment': <DesktopEnvironment.GNOME: 1>,
   'display_manager_is_wayland': False,
   'envs': {  'LD_LIBRARY_PATH': '',
              'TESSDATA_PREFIX': '/app/share',
              'TESSERACT_CMD': None,
              'TESSERACT_VERSION': None},
   'gnome_version': None,
   'is_flatpak_package': True,
   'is_prebuild_package': None,
   'normcap_version': '0.3.12',
   'platform': 'linux',
   'pyside6_version': '6.4.0',
   'qt_library_path': '/usr/share/runtime/lib/plugins, '
                      '/app/lib/python3.9/site-packages/PySide6/Qt/plugins',
   'qt_version': '6.4.0',
   'screens': {},
   'tessdata_path': '/home/REDACTED/.var/app/com.github.dynobo.normcap/config/normcap/tessdata'}

Variables:

                  '__builtins__': <module 'builtins' (built-in)>,
                  '__cached__': None,
                  '__doc__': None,
                  '__file__': '/app/bin/normcap',
                  '__loader__': <_frozen_importlib_external.SourceFileLoader object at 0x7facee1eaf70>,
                  '__name__': '__main__',
                  '__package__': None,
                  '__spec__': None,
                  'main': <function main at 0x7facee13b3a0>,
                  're': <module 're' from '/usr/lib/python3.9/re.py'>,
                  'sys': <module 'sys' (built-in)>},
   'main': {  'args': Namespace(color=None, language=None, mode=None, notification=None, tray=None, update=None, reset=False, verbosity='warning'),
              'logger': <Logger normcap (WARNING)>},
   'qt_log_wrapper': {  '_': <PySide6.QtCore.QMessageLogContext object at 0x7face71867c0>,
                        'message': 'QApplication: invalid style override '
                                   "'kvantum' passed, ignoring it.\n"
                                   '\tAvailable styles: Windows, Fusion',
                        'mode': <QtMsgType.QtWarningMsg: 1>}}

Exception:

  AttributeError: 'str' object has no attribute 'decode'

Traceback:

  File "/app/bin/normcap", line 8, in <module>
    sys.exit(main())
  File "/app/lib/python3.9/site-packages/normcap/app.py", line 54, in main
    app = QtWidgets.QApplication(sys.argv)
  File "/app/lib/python3.9/site-packages/normcap/gui/utils.py", line 53, in qt_log_wrapper
    level = mode.name.decode("utf8").lower()

18:33:58 - CRITICAL - normcap.gui.utils:227 - Please open an issue with the output above on https://github.com/dynobo/normcap/issues

[archisman-panigrahi]

The appimage works normally after installing fuse. https://techpiezo.com/linux/error-appimages-require-fuse-to-run-in-ubuntu-22-04/

[dynobo]

@apandada1, Could you please try updating the FlatPak to NormCap v0.3.13 and check, if the issue is fixed? (At least the line that caused the error got changed in the meanwhile...)
I'd be happy to hear, if that helped!

[archisman-panigrahi]

The issue came up in a computer in my office. I will get back on Monday.

…

On Sat, 22 Oct, 2022, 6:00 pm dynobo, ***@***.***> wrote: @apandada1 <https://github.com/apandada1>, Could you please try updating the FlatPak to NormCap v0.3.13 and check, if the issue is fixed? (At least the line that caused the error got changed in the meanwhile...) I'd be happy to hear, if that helped! — Reply to this email directly, view it on GitHub <#290 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAXL2XFYDNJ4GNTBTHEN633WERPZTANCNFSM6AAAAAARJSEYFI> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[archisman-panigrahi]

Still does not work.

$ flatpak run com.github.dynobo.normcap
ERROR: ld.so: object 'libgtk3-nocsd.so.0' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
Gtk-Message: 12:22:56.122: Failed to load module "xapp-gtk3-module"
Gtk-Message: 12:22:56.122: Failed to load module "unity-gtk-module"
Gtk-Message: 12:22:56.183: Failed to load module "canberra-gtk-module"
Gtk-Message: 12:22:56.183: Failed to load module "canberra-gtk-module"
12:22:56 - WARNING - normcap.screengrab.utils:94 - Exception when trying to get gnome version from xml 
Invalid tesseract version: "ERROR: ld.so: object 'libgtk3-nocsd.so.0' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
tesseract 5.2.0
 leptonica-1.82.0
  libgif 5.2.1 : libjpeg 6b (libjpeg-turbo 2.1.3) : libpng 1.6.37 : libtiff 4.3.0 : zlib 1.2.11 : libwebp 1.2.1 : libopenjp2 2.4.0
 Found AVX
 Found SSE4.1
 Found libarchive 3.5.2 zlib/1.2.11 liblzma/5.2.5 bz2lib/1.0.8
 Found libcurl/7.82.0-DEV GnuTLS/3.7.2 zlib/1.2.11 libidn2/2.3.1 nghttp2/1.44.0
"

[dynobo]

Hi @apandada1, thanks for trying it again. This is now a different error. I'm able to reproduce it in Ubuntu Unity, but unfortunately I don't know how to fix it.

Contributions, ideas or further observations are very welcome!

Here's what I found out so far:

1. The root problem for NormCap is the error message (ERROR: ld.so: object 'libgtk3-nocsd.so.0' from LD_PRELOAD cannot be preloaded [...]) that gets printed on any command evocation...
2. ... because this additional text breaks pytesseract's parsing of the output of tesseract --version to identify the Tesseract version.
3. The error itself probably isn't an issue for NormCap or pytesseract, only the error message that gets printed!
4. The root cause of the error itself seems to be, that gtk3-nocsd tries to wrap every application-call in order to remove the client side decorations, but everything running inside the Flatpak container is not allowed to access libgtk3-nocsd.so.0 on the system.
5. Some people suggest to just uninstall gtk3-nocsd: ERROR: ld.so: object 'libgtk3-nocsd.so.0' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored. flathub/org.qownnotes.QOwnNotes#109
6. Unfortunately, this seems not a good solution for Unity, which seems to depend on it quite heavily. For other desktop environment's this might be a good option.

Some thoughts on potential solutions:

1. Can flatpak somehow be executed without being wrapped by gtk3-nocsd? So libgtk3-nocsd.so.0 isn't preloaded at all?
2. Can the output of the error be suppressed somehow?
3. Can the version parsing in pytesseract be made more robust to not break in case of such additional output?

[archisman-panigrahi]

Thank you for putting the effort to find out the cause of the error.

Can the version parsing in pytesseract be made more robust to not break in case of such additional output?

Yeah, if pytesseract can be made to search for the version number in the whole error message, instead of searching in the very first line, then this can be solved. However, I don't know enough python to fix that.

I don't know if the error message can be somehow suppressed.

[dynobo]

Right after posting my last comment, I had an idea how to do (1) of the potential solutions, tried it, and it worked:
LD_PRELOAD="" flatpak run com.github.dynobo.normcap
Starting the flatpak like this disables nocsd for this single call and fixes the issue.

PS: Unfortunately, NormCap looks quite ugly on Unity: It seems like Unity prevents it from going fullscreen...

[archisman-panigrahi]

Yeah, it works!!

[dynobo]

Hi @apandada1, the latest v0.3.14 release adds some improvements for Unity:

• Fullscreen should be working properly now
• No need to set LD_PRELOAD="" anymore.
  (You might still see ERROR: ld.so: object 'libgtk3-nocsd.so.0' in the CLI, but it should't have any negative effect in NormCap.)

Do you want to give it a try and report back your experience?

[archisman-panigrahi]

Works perfectly!! I verified both the flatpak the appimage also works properly with fullscreen, and neither crashes.
Thank you.