I have similar problem,
Unrecoverable failure in required component org.gnome.Shell.desktop
and
CRITICAL: We failed, but the fail whale is dead. Sorry....
and some Unable to get on D-Bus
My desktop is still working, some third party software like firefox is ok,
BUT gedit cannot launch, gnome-terminal cannot launch, settings cannot launch and most of gnome desktop apps are not able to launch.
I had tried to turn off Nvidia graphic card and using native intel, but those basic apps are still not able to launch.
I have similar problem, Shell.desktop
Unrecoverable failure in required component org.gnome.
and
CRITICAL: We failed, but the fail whale is dead. Sorry....
and some Unable to get on D-Bus
My desktop is still working, some third party software like firefox is ok,
BUT gedit cannot launch, gnome-terminal cannot launch, settings cannot launch and most of gnome desktop apps are not able to launch.
I had tried to turn off Nvidia graphic card and using native intel, but those basic apps are still not able to launch.
Please help!
Ubuntu 18.04