Gala won't update Aug 20

same problem.
dist-upgrade doesn't work either

bryan@bryan-e6410:~$ sudo apt-get -s install gala
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help resolve the situation:

The following packages have unmet dependencies:
 gala : Depends: libmutter0 (= 3.4.1-0ubuntu99~elementary7) but 3.4.1-0ubuntu99~elementary6.1 is to be installed
E: Unable to correct problems, you have held broken packages.

bryan@bryan-e6410:~$ sudo apt-get remove libmutter0
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
  gala libmutter0 switchboard-plug-pantheon-shell
0 upgraded, 0 newly installed, 3 to remove and 0 not upgraded.
After this operation, 2,079 kB disk space will be freed.
Do you want to continue [Y/n]? y
(Reading database ... 181469 files and directories currently installed.)
Removing switchboard-plug-pantheon-shell ...
Removing gala ...
Removing libmutter0 ...
Processing triggers for libglib2.0-0:i386 ...
Processing triggers for libglib2.0-0 ...
Processing triggers for desktop-file-utils ...
Processing triggers for bamfdaemon ...
Rebuilding /usr/share/applications/bamf.index...
Processing triggers for gnome-menus ...
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
bryan@bryan-e6410:~$ sudo apt-get update

========Installed http://ppa.launchpad.net/elementary-os/stable/ubuntu/pool/main/m/mutter/libmutter-dev_3.4.1-0ubuntu99~elementary7_amd64.deb Manually ==============

bryan@bryan-e6410:~$ sudo apt-get install gala
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  gala
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 115 kB of archives.
After this operation, 392 kB of additional disk space will be used.
Get:1 http://ppa.launchpad.net/elementary-os/stable/ubuntu/ precise/main gala amd64 0.1-0~r353+pkg18+r1~ubuntu12.04.1 [115 kB]
Fetched 115 kB in 1s (60.4 kB/s)
Selecting previously unselected package gala.
(Reading database ... 181403 files and directories currently installed.)
Unpacking gala (from .../gala_0.1-0~r353+pkg18+r1~ubuntu12.04.1_amd64.deb) ...
Processing triggers for desktop-file-utils ...
Processing triggers for bamfdaemon ...
Rebuilding /usr/share/applications/bamf.index...
Processing triggers for gnome-menus ...
Processing triggers for libglib2.0-0:i386 ...
Processing triggers for libglib2.0-0 ...
Setting up gala (0.1-0~r353+pkg18+r1~ubuntu12.04.1) ...
update-alternatives: using /usr/bin/gala to provide /usr/bin/x-window-manager (x-window-manager) in auto mode.

bryan@bryan-e6410:~$ sudo apt-get install switchboard-plug-pantheon-shell

And I am clear of that hurdle as far as I understand.

I recieved this error earlier, then I clicked the check button in Update Manager, and it updated fine. This happens with some packages, from time to time. I wait a day or a few hours, and it's able to install. I don't know why this is happening, sometimes with third party software, like vlc ppa's. I suggest you always click the check button in Update Manager each time you use it, or you may miss some updates.