[Bug 55374] upgrade issue with configured asterisk

[Jeff Waugh]

Public bug reported:

If asterisk configuration changes are made that include configuration
file deletion, asterisk cannot be upgraded.

Setting up asterisk-classic (1.2.7.1.dfsg-2ubuntu3.1) ...
chown: cannot access `/etc/asterisk/voicemail.conf': No such file or directory
dpkg: error processing asterisk-classic (--configure):
 subprocess post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of asterisk:

** Affects: asterisk (Ubuntu)
     Importance: Untriaged
     Assignee: MOTU
         Status: Confirmed

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upgrade issue with configured asterisk
https://launchpad.net/bugs/55374