It looks like you registered a third-party app with update-alternatives.
So it is a local issue on your system, not a bug in metacity.
** Changed in: metacity (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1732953
Title:
package metacity 1:3.18.7-0ubuntu0.3 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 2
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