This shows that your system has been booted without the 'splash' option - so the console-only prompt is the expected behavior. Was this how the bootloader was configured after install, or are you doing something to pass non-default options to the kernel?
> ProcCmdLine: BOOT_IMAGE= /vmlinuz- 3.8.0-19- generic root=/dev/ mapper/ kubuntu- -vg-root ro
This shows that your system has been booted without the 'splash' option - so the console-only prompt is the expected behavior. Was this how the bootloader was configured after install, or are you doing something to pass non-default options to the kernel?