I am unable to browse by cover art in Rhythmbox. Apparently plugin is installed and active but I don't see the left pane option "Browse by cover art"
EDIT: I can't install cover browser for some reason:
Added log from command line as proposed by comment #2:
(rhythmbox:9231): Gtk-CRITICAL **: gtk_css_provider_load_from_path: assertion 'path != NULL' failed
(rhythmbox:9231): GLib-GObject-CRITICAL **: object SoupServer 0x170e6c0 finalized while still in-construction
(rhythmbox:9231): GLib-GObject-CRITICAL **: Custom constructor for class SoupServer returned NULL (which is invalid). Please use GInitable instead.
(rhythmbox:9231): libpeas-WARNING **: Could not find loader 'python' for plugin 'coverart_search_providers'
The plugins I downloaded and instructions I followed are the links pasted in my comment #1. Also some other cover art plugin was there when I first installed Ubuntu.