Same problem with ppa version. (By the way, thank you for this nice
software.)

INFO - Starting gscan2pdf 2.6.5
INFO - Log level DEBUG
INFO - Using tr_TR.UTF-8 locale
INFO - Startup LC_NUMERIC C
INFO - Reading config from /home/utku/.config/gscan2pdfrc
INFO - Config file version 2
DEBUG - $VAR1 = {};

INFO - Operating system: linux
INFO - DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=19.10
DISTRIB_CODENAME=eoan
DISTRIB_DESCRIPTION="Ubuntu 19.10"
INFO - NAME="Ubuntu"
VERSION="19.10 (Eoan Ermine)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 19.10"
VERSION_ID="19.10"
HOME_URL="https://www.ubuntu.com/";
SUPPORT_URL="https://help.ubuntu.com/";
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/";
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy";
VERSION_CODENAME=eoan
UBUNTU_CODENAME=eoan
INFO - Perl version v5.28.1
INFO - Glib-Perl version 1.3291
INFO - Glib::Object::Introspection version 0.047
INFO - Built for Glib 2.62.0
INFO - Running with Glib 2.62.4
INFO - Gtk3-Perl version 0.036
INFO - Built for GTK 3.24.12
INFO - Running with GTK 3.24.12
INFO - Gscan2pdf::Document version 2.6.5
INFO - Using PDF::API2 version 2.033
INFO - Using Sane version 1.0.27
INFO - Using libimage-sane-perl version 5
DEBUG - $VAR1 = {
          'Blank threshold' => '0.005',
          'Dark threshold' => '0.12',
          'OCR on scan' => 1,
          'OCR output' => 'replace',
          'Page range' => 'all',
          'Paper' => {
                       'A3' => {
                                 'l' => 0,
                                 't' => 0,
                                 'x' => 297,
                                 'y' => 420
                               },
                       'A4' => {
                                 'l' => 0,
                                 't' => 0,
                                 'x' => 210,
                                 'y' => 297
                               },
                       'US Legal' => {
                                       'l' => 0,
                                       't' => 0,
                                       'x' => 216,
                                       'y' => 356
                                     },
                       'US Letter' => {
                                        'l' => 0,
                                        't' => 0,
                                        'x' => 216,
                                        'y' => 279
                                      }
                     },
          'SANE version' => '1.0.27',
          'TMPDIR' => undef,
          'adf-defaults-scan-all-pages' => 1,
          'allow-batch-flatbed' => '',
          'author' => undef,
          'author-suggestions' => undef,
          'auto-open-scan-dialog' => 1,
          'available-tmp-warning' => 10,
          'brightness tool' => 65,
          'cache' => undef,
          'cache options' => 1,
          'cancel-between-pages' => '',
          'close_dialog_on_save' => 1,
          'contrast tool' => 65,
          'convert whitespace to underscores' => '',
          'current_psh' => undef,
          'current_udt' => undef,
          'cwd' => undef,
          'cycle sane handle' => '',
          'datetime offset' => [
                                 0,
                                 0,
                                 0,
                                 0
                               ],
          'default filename' => '%Da %DY-%Dm-%Dd.%De',
          'default profile' => undef,
          'default-scan-options' => undef,
          'device' => undef,
          'device blacklist' => undef,
          'downsample' => '',
          'downsample dpi' => 150,
          'frontend' => 'libimage-sane-perl',
          'ignore-duplex-capabilities' => '',
          'image type' => undef,
          'keywords' => undef,
          'keywords-suggestions' => undef,
          'libimage-sane-perl version' => '5',
          'message' => {},
          'message_window_height' => 200,
          'message_window_width' => 600,
          'ocr engine' => 'tesseract',
          'ocr language' => undef,
          'pdf compression' => 'auto',
          'pdf font' => undef,
          'post_save_hook' => '',
          'profile' => undef,
          'ps_backend' => 'pdftops',
          'quality' => 75,
          'restore window' => 1,
          'rotate facing' => 0,
          'rotate reverse' => 0,
          'scan prefix' => '',
          'scan-reload-triggers' => 'mode',
          'scan_window_height' => undef,
          'scan_window_width' => undef,
          'selection' => undef,
          'set_timestamp' => 1,
          'subject' => undef,
          'subject-suggestions' => undef,
          'threshold tool' => 80,
          'threshold-before-ocr' => '',
          'thumb panel' => 100,
          'tiff compression' => undef,
          'title' => undef,
          'title-suggestions' => undef,
          'to_png' => 1,
          'udt_on_scan' => '',
          'unpaper on scan' => '',
          'unpaper options' => undef,
          'unsharp amount' => 1,
          'unsharp radius' => 0,
          'unsharp sigma' => 1,
          'unsharp threshold' => '0.05',
          'use_time' => '',
          'use_timezone' => 1,
          'user_defined_tools' => [
                                    'gimp %i'
                                  ],
          'version' => undef,
          'view files toggle' => 1,
          'viewer_tools' => 100,
          'visible-scan-options' => {
                                      'Paper size' => 1,
                                      'adf-mode' => 1,
                                      'adf_mode' => 1,
                                      'batch-scan' => 1,
                                      'brightness' => 1,
                                      'button-wait' => 1,
                                      'calibration-cache' => 1,
                                      'compression' => 1,
                                      'contrast' => 1,
                                      'gain' => 1,
                                      'l' => 1,
                                      'mode' => 1,
                                      'overscan-bottom' => 1,
                                      'overscan-top' => 1,
                                      'page-height' => 1,
                                      'page-width' => 1,
                                      'pageheight' => 1,
                                      'pagewidth' => 1,
                                      'resolution' => 1,
                                      'source' => 1,
                                      'speed' => 1,
                                      't' => 1,
                                      'threshold' => 1,
                                      'wait-for-button' => 1,
                                      'x' => 1,
                                      'y' => 1
                                    },
          'window_height' => 600,
          'window_maximize' => 1,
          'window_width' => 800,
          'window_x' => undef,
          'window_y' => undef
        };

INFO - scanimage --version
INFO - Forked PID 10884
INFO - Checking /tmp for crashed sessions
INFO - Using /tmp/gscan2pdf-Wq5_ for temporary files
INFO - which tesseract
INFO - Spawned PID 10891
INFO - tesseract -v
INFO - Spawned PID 10892
INFO - Found tesseract version 4.1.0.
INFO - which ocroscript
INFO - Spawned PID 10893
INFO - which cuneiform
INFO - Spawned PID 10894
INFO - unpaper --version
INFO - Spawned PID 10895
INFO - Found Image::Magick 6.9.10
INFO - Found unpaper 6.1
INFO - convert --version
INFO - Spawned PID 10896
INFO - Found imagemagick 6.9.10-23
INFO - gm -version
INFO - gm -version: command not found
INFO - scanadf --version
INFO - Spawned PID 10898
INFO - Found scanadf 1.0.14
INFO - xdg-email --version
INFO - Spawned PID 10899
INFO - Found xdg 1.1.3
INFO - gocr -h
INFO - Found gocr -h: command not found
INFO - cjb2 --version
INFO - Spawned PID 10901
INFO - Found djvu 3.5.27
INFO - tiffcp -h
INFO - Spawned PID 10902
INFO - Found libtiff 4.0.10
INFO - pdftops -v
INFO - Spawned PID 10903
INFO - Found pdftops 0.80.0
INFO - pdfunite -v
INFO - Spawned PID 10904
INFO - Found pdfunite 0.80.0
INFO - gs --version
INFO - Spawned PID 10905
INFO - Found pdf2ps 9.27
INFO - pdftk --version
INFO - Spawned PID 10906
INFO - Found pdftk 3.0.2
INFO - convert rose: /tmp/gscan2pdf-Wq5_/bWRodzKhWw.tif
INFO - Spawned PID 10924
WARN - Use of uninitialized value in numeric ne (!=) at 
/usr/share/perl5/PDF/API2/Resource/XObject/Image/TIFF/File.pm line 39.

WARN - Use of uninitialized value in concatenation (.) or string at
/usr/share/perl5/PDF/API2/Resource/XObject/Image/TIFF/File.pm line 39.

WARN - *** unhandled exception in callback:
***   Wrong TIFF Id '' (should be 42). at 
/usr/share/perl5/PDF/API2/Resource/XObject/Image/TIFF/File.pm line 39.
***  ignoring at 
/usr/lib/x86_64-linux-gnu/perl5/5.28/Glib/Object/Introspection.pm line 67.

INFO - Waiting to reap process
INFO - Reaped PID -1
WARN - Use of uninitialized value $SETTING{"cwd"} in chdir at 
/usr/bin/gscan2pdf line 5650.

WARN - *** unhandled exception in callback:
***   Can't call method "get_position" on an undefined value at 
/usr/bin/gscan2pdf line 5660.
***  ignoring at 
/usr/lib/x86_64-linux-gnu/perl5/5.28/Glib/Object/Introspection.pm line 67.

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https://bugs.launchpad.net/bugs/1869579

Title:
  gscan2pdf was opening with a blank window with only title bar.

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