I have Debian 10 and KDE Plasma. gnome-system-monitor had been working perfectly for 10 months, and all of a sudden when I try to open it in KDE I get this error:
gnome-system-monitor
(gnome-system-monitor:28523): Gtk-WARNING **: 14:51:50.934: Theme
parsing error: gtk.css:127:35: The style property
GtkButton:child-displacement-x is deprecated and shouldn't be used
anymore. It will be removed in a future version
(gnome-system-monitor:28523): Gtk-WARNING **: 14:51:50.935: Theme
parsing error: gtk.css:128:35: The style property
GtkButton:child-displacement-y is deprecated and shouldn't be used
anymore. It will be removed in a future version
(gnome-system-monitor:28523): Gtk-WARNING **: 14:51:50.935: Theme
parsing error: gtk.css:129:34: The style property
GtkCheckButton:indicator-size is deprecated and shouldn't be used
anymore. It will be removed in a future version
(gnome-system-monitor:28523): Gtk-WARNING **: 14:51:50.935: Theme
parsing error: gtk.css:130:36: The style property
GtkCheckMenuItem:indicator-size is deprecated and shouldn't be used
anymore. It will be removed in a future version
(gnome-system-monitor:28523): Gtk-WARNING **: 14:51:50.935: Theme
parsing error: gtk.css:132:46: The style property
GtkScrolledWindow:scrollbars-within-bevel is deprecated and shouldn't
be used anymore. It will be removed in a future version
(gnome-system-monitor:28523): Gtk-WARNING **: 14:51:50.935: Theme
parsing error: gtk.css:135:30: The style property
GtkExpander:expander-size is deprecated and shouldn't be used anymore.
It will be removed in a future version
(gnome-system-monitor:28523): Gtk-WARNING **: 14:51:50.936: Theme
parsing error: gtk.css:142:29: The style property
GtkStatusbar:shadow-type is deprecated and shouldn't be used anymore.
It will be removed in a future version
(gnome-system-monitor:28523): glibmm-CRITICAL **: 14:51:50.990:
unhandled exception (type Glib::Error) in signal handler: domain:
g-io-error-quark code : 0 what : Unable to find default local file
monitor type
I have no idea what this means or why it started happening.
