Confirmed for me too. It happens in several terminal issued commands involving GUI. The last of those command was Zenity dialog. "GtkDialog mapped without a transient parent. This is discouraged." appeared after each Zenity step (2): one for choose a direcctory to copy, and one for choose a directory where copy previously selected files.
My OS environment: ----------------------- Actual system description --------------------- kernel name is: Linux kernel-release is: 4.4.0-36-generic kernel version is: #55-Ubuntu SMP Thu Aug 11 18:00:59 UTC 2016 machine hardware is: i686 processor type is: i686 h/w platform is: i686 **************** OS specs ******************* operating system is: GNU/Linux desktop env. is: xubuntu - XDG_CURRENT_DESKTOP=XFCE Distributor ID: xenial Description: Ubuntu Release: Ubuntu 16.04.1 LTS Codename: 16.04 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1467588 Title: Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. (process:17035): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/1467588/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
