Upgrade to quantal: php-apc upgrade (or remove) fails, missing php5dismod

[Nick Semenkovich]

On upgrading to quantal, php-apc failed to upgrade, and could not be manually removed via apt.

php5dismod does not exist (but is called via /var/lib/dpkg/info/php-apc.prerm )

Errors were encountered while processing:
 php-apc
E: Sub-process /usr/bin/dpkg returned an error code (1)

$ sudo apt-get remove php-apc
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
  php-apc
0 upgraded, 0 newly installed, 1 to remove and 45 not upgraded.
1 not fully installed or removed.
After this operation, 256 kB disk space will be freed.
Do you want to continue [Y/n]?
(Reading database ... 91083 files and directories currently installed.)
Removing php-apc ...
/var/lib/dpkg/info/php-apc.prerm: 9: /var/lib/dpkg/info/php-apc.prerm: php5dismod: not found
dpkg: error processing php-apc (--remove):
 subprocess installed pre-removal script returned error exit status 127
Errors were encountered while processing:
 php-apc
E: Sub-process /usr/bin/dpkg returned an error code (1)

$ cat /var/lib/dpkg/info/php-apc.prerm
#!/bin/sh
set -e

dpkg-maintscript-helper mv_conffile /etc/php5/conf.d/apc.ini \
        /etc/php5/mods-available/apc.ini 3.1.10-1~ -- "$@"

case "$1" in
    remove|upgrade|deconfigure)
        php5dismod apc
    ;;

    failed-upgrade)
    ;;

    *)
        echo "prerm called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac
exit 0

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: php-apc 3.1.10-1
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.1.1-0ubuntu1
Architecture: amd64
Date: Thu May 31 10:31:18 2012
ProcEnviron:
 TERM=screen
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: php-apc
UpgradeStatus: Upgraded to quantal on 2012-03-05 (87 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.