Quite similar to comment #12 except I upgraded to Ubuntu 12.04 Beta ?? on 2012-04-17 from Ubuntu 11.10.
Release 12.04 (precise) 32-bit
Kernel Linux 3.2.0-23-generic
GNOME 3.4.1
After login in, the error message was self generated (I did not open nautilus).
Quite similar to comment #12 except I upgraded to Ubuntu 12.04 Beta ?? on 2012-04-17 from Ubuntu 11.10.
Release 12.04 (precise) 32-bit
Kernel Linux 3.2.0-23-generic
GNOME 3.4.1
After login in, the error message was self generated (I did not open nautilus).