Thanks for your report.

The relevant error is
---
Setting up metacity (1:2.28.0-0ubuntu2) ...
update-alternatives: warning: /etc/alternatives/x-window-manager has been 
changed (manually or by a script). Switching to manual updates only.
update-alternatives: warning: forcing reinstallation of alternative 
../../usr/bin/metacity because link group x-window-manager is broken.
Can't call method "slave" on an undefined value at 
/usr/sbin/update-alternatives line 1017.
dpkg: error processing metacity (--configure):
 subprocess installed post-installation script returned error exit status 2


** Summary changed:

- package metacity 1:2.28.0-0ubuntu2 failed to install/upgrade: subprocess 
installed post-installation script returned error exit status 2
+ package metacity 1:2.28.0-0ubuntu2 failed to install/upgrade: exit status 2 - 
Can't call method "slave" on an undefined value at 
/usr/sbin/update-alternatives line 1017.

-- 
package metacity 1:2.28.0-0ubuntu2 failed to install/upgrade: exit status 2 - 
Can't call method "slave" on an undefined value at 
/usr/sbin/update-alternatives line 1017.
https://bugs.launchpad.net/bugs/524469
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