Vbox真的比VMware好用？

ubuntu 10.04.2 安装kvm虚拟机，新建时发生错误无法完成安装：'internal error unable to start guest: char device redirected to /dev/pts/0
qemu: could not open disk image /var/lib/libvirt/images/xp.img: No such file or directory

Unable to complete install '<class 'libvirt.libvirtError'> internal error unable to start guest: char device redirected to /dev/pts/0
qemu: could not open disk image /var/lib/libvirt/images/xp.img: No such file or directory

Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/create.py", line 1436, in do_install
dom = guest.start_install(False, meter = meter)
File "/usr/lib/pymodules/python2.6/virtinst/Guest.py", line 660, in start_install
return self._do_install(consolecb, meter, removeOld, wait)
File "/usr/lib/pymodules/python2.6/virtinst/Guest.py", line 758, in _do_install
self.domain = self.conn.createLinux(install_xml, 0)
File "/usr/lib/python2.6/dist-packages/libvirt.py", line 1097, in createLinux
if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self)
libvirtError: internal error unable to start guest: char device redirected to /dev/pts/0
qemu: could not open disk image /var/lib/libvirt/images/xp.img: No such file or directory

'
不知道是什么原因，求高手指教，本人安装KVM过程如下
sudo apt-get install kvm libvirt-bin ubuntu-vm-builder bridge-utils kvm-pxe uml-utilities

sudo apt-get install virt-manager virt-viewer
直接用图形界面的方式安装