text mode can't be used in ubuntu 11.10

[Mike Cao]

after starting GUI I did following things:

1. #init 3
2 #telinit 3

all can not switch to text mode

Also tried following steps
1.#init 1 ---> it works and switch into single mode
2.#init 3
After step 2 ,black sreen happend on the host and no idea how to change back to normal

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: initscripts 2.88dsf-13.10ubuntu4
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Mon Oct 31 15:27:32 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: sysvinit
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.