Thanks for hint. Indeed clamav + few its graphical packages are installed yet in use. clamtk-gnome package was removed then Ubuntu restarted.
Subsequently all these below apply: Problem still reproducible. user45@node13a:~$ sudo ls -alh /usr/share/nautilus-python/extensions/ [sudo] password for biri: total 8.0K drwxr-xr-x 2 root root 4.0K Jan 29 23:54 . drwxr-xr-x 3 root root 4.0K Aug 2 01:40 .. user45@node13a:~$ Jan 29 23:57:27 nautilus: Called "net usershare info" but it failed: 'net usershare' returned error 255: net usershare: cannot open usershare directory /var/lib/samba/usershares. Error No such file or directory Please ask your system administrator to enable user sharing. Jan 29 23:57:27 dbus-daemon: [session uid=1000 pid=1808] Successfully activated service 'org.gnome.Nautilus' Jan 29 23:57:27 dbus-daemon: [session uid=1000 pid=1808] Successfully activated service 'org.gnome.Nautilus' Jan 29 23:57:27 dbus-daemon: [session uid=1000 pid=1808] Activating service name='org.gnome.Nautilus' requested by ':1.29' (uid=1000 pid=1942 comm="/usr/bin/gnome-shell " label="unconfined") Jan 29 23:57:24 nautilus: Error reading events from display: Invalid argument Jan 29 23:57:24 nautilus: Error reading events from display: Invalid argument Jan 29 23:57:22 nautilus: ../../../../../gdk/x11/gdkwindow-x11.c:5633 drawable is not a native X11 window Jan 29 23:57:22 nautilus: ../../../../../gdk/x11/gdkwindow-x11.c:5633 drawable is not a native X11 window Jan 29 23:57:22 nautilus: gdk_window_get_window_type: assertion 'GDK_IS_WINDOW (window)' failed Jan 29 23:57:19 nautilus: ../../../../../gdk/x11/gdkwindow-x11.c:5633 drawable is not a native X11 window Jan 29 23:57:19 nautilus: ../../../../../gdk/x11/gdkwindow-x11.c:5633 drawable is not a native X11 window Jan 29 23:57:19 nautilus: ../../../../../gdk/x11/gdkwindow-x11.c:5633 drawable is not a native X11 window Jan 29 23:57:18 nautilus: ../../../../../gdk/x11/gdkwindow-x11.c:5633 drawable is not a native X11 window Jan 29 23:57:08 nautilus: Called "net usershare info" but it failed: 'net usershare' returned error 255: net usershare: cannot open usershare directory /var/lib/samba/usershares. Error No such file or directory Please ask your system administrator to enable user sharing. Jan 29 23:57:08 dbus-daemon: [session uid=1000 pid=1808] Activating via systemd: service name='org.gtk.vfs.Metadata' unit='gvfs-metadata.service' requested by ':1.41' (uid=1000 pid=2028 comm="/usr/bin/nautilus --gapplication-service " label="unconfined") Jan 29 23:57:08 nautilus: ../../../../../gdk/x11/gdkwindow-x11.c:5633 drawable is not a native X11 window Jan 29 23:57:08 nautilus: ../../../../../gdk/x11/gdkwindow-x11.c:5633 drawable is not a native X11 window Jan 29 23:57:05 nautilus: Failed to load module "unity-gtk-module" Jan 29 23:57:01 gnome-session-b: WARNING: Could not parse desktop file nautilus-autostart.desktop or it references a not found TryExec binary Jan 29 23:57:01 gnome-session-b: WARNING: Could not parse desktop file nautilus-autostart.desktop or it references a not found TryExec binary Jan 29 23:57:01 gnome-session-b: gnome-session-binary[1926]: WARNING: Could not parse desktop file nautilus-autostart.desktop or it references a not found TryExec binary -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1913644 Title: Closing by itself upon moving file to bookmarked folder To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/1913644/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs