[PVE-User] Can not upgrade 2.0rc to 2.0 final

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I'm using Proxmox VE 2.0 RC (version 2.0-38/af81df02).

When I upgrade system with aptitude command , error happened.

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# aptitude upgrade
The following packages will be upgraded:
  vzctl
1 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/241 kB of archives. After unpacking 20.5 kB will be used.
Do you want to continue? [Y/n/?] y
Reading changelogs... Done
(Reading database ... 30376 files and directories currently installed.)
Preparing to replace vzctl 3.0.29-3pve3 (using .../vzctl_3.0.30-2pve1_amd64.deb) ...
unable to backup existing configuration
dpkg: error processing /var/cache/apt/archives/vzctl_3.0.30-2pve1_amd64.deb (--unpack):
 subprocess new pre-installation script returned error exit status 1
configured to not write apport reports
                                      Errors were encountered while processing:
 /var/cache/apt/archives/vzctl_3.0.30-2pve1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install.  Trying to recover:
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Does anyone know how to solve this probrem.

oota