A recent update to Xorg broke my desktop, which now looks like this: http://i.imgur.com/PbBxh.jpg

In short, the desktop background is not updating on the secondary display. (And if there is no secondary display, the primary display background stops updating.)

Looking into the history, I found that this happened right after upgrading two packages:

• xserver-xorg-core
• xserver-common

These were upgraded to 1.9.0-0ubuntu7.3.

I'd like to downgrade these packages. How do I do that?

I've checked that both have another version in the maverick repo:

xserver-xorg-core:
  Installed: 2:1.9.0-0ubuntu7.3
  Candidate: 2:1.9.0-0ubuntu7.3
  Version table:
 *** 2:1.9.0-0ubuntu7.3 0
        500 http://fi.archive.ubuntu.com/ubuntu/ maverick-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     2:1.9.0-0ubuntu7 0
        500 http://fi.archive.ubuntu.com/ubuntu/ maverick/main amd64 Packages

However, apt won't let me downgrade them:

ville@fluxx ~ % sudo apt-get install xserver-common=2:1.9.0-0ubuntu7 xserver-xorg-core=2:1.9.0-0ubuntu7

The following packages have unmet dependencies:
 xserver-xorg-core : Depends: xserver-xorg but it is not going to be installed
E: Broken packages

And this is the reason:

ville@fluxx ~ % sudo apt-get install xserver-common=2:1.9.0-0ubuntu7 xserver-xorg-core=2:1.9.0-0ubuntu7 xserver-xorg-core

The following packages have unmet dependencies:
 xserver-xorg-core : Depends: xserver-common (>= 2:1.9.0-0ubuntu7.3) but 2:1.9.0-0ubuntu7 is to be installed
E: Broken packages

Am I out of options here?