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[David King <strix@xxxxxxxxxxxxxxxxxx>]

Evidence from another machine I administer (same version of OS and
unattended-upgrades and that uses a similar PHP configuration) suggests
that the bug may only manifest if the previous state was 'un' rather
than 'rc':

$ dpkg -l libapache2-mod-php5|grep ^[a-z]
rc  libapache2-mod-php5                             5.3.10-1ubuntu3.6                    i386

on this machine, unattended upgrades did not attempt to install
libapache2-mod-php5.

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https://bugs.launchpad.net/bugs/1434115

Title:
  apparently broken dependency resolution

Status in unattended-upgrades package in Ubuntu:
  New

Bug description:
  It looks as though unattended upgrades' dependency resolution is a
  little broken when there are multiple alternatives and when the
  dependency is currently satisfied by a package other than the first
  alternative.

  In this case, package php5 was upgraded.  php5 depends:

  $ dpkg -s php5|grep Depends
  Depends: libapache2-mod-php5 (>= 5.5.9+dfsg-1ubuntu4.7) | libapache2-mod-php5filter (>= 5.5.9+dfsg-1ubuntu4.7) | php5-cgi (>= 5.5.9+dfsg-1ubuntu4.7) | php5-fpm (>= 5.5.9+dfsg-1ubuntu4.7), php5-common (>= 5.5.9+dfsg-1ubuntu4.7)

  I use php5-fpm, and specifically do not want libapache2-mod-php5
  installed (not least because it breaks my FPM config).  After manually
  purging libapache2-mod-php5:

  $ dpkg -l $(dpkg -s php5|grep Depends|perl -npe 's/Depends://; s/[,|]/\n/g'|cut -f 2 -d\ )|grep ^[a-z]
  un  libapache2-mod-php5                             <none>                               <none>       (no description available)
  un  libapache2-mod-php5filter                       <none>                               <none>       (no description available)
  un  php5-cgi                                        <none>                               <none>       (no description available)
  ii  php5-common                                     5.5.9+dfsg-1ubuntu4.7                amd64        Common files for packages built from the php5 source
  ii  php5-fpm                                        5.5.9+dfsg-1ubuntu4.7                amd64        server-side, HTML-embedded scripting language (FPM-CGI binary)

  note that:
  • php5-fpm is installed and therefore that dependency of php5 was already satisfied
  • php5-cgi and libapache2-mod-php5filter are alternative dependencies along with libapache2-mod-php5, yet neither got installed in the way that libapache2-mod-php5 did.

  
  For completeness' sake, here's an excerpt of the unattended upgrade log (full log attached) showing that it was this morning's upgrade run that installed libapache2-mod-php5:

  Selecting previously unselected package libapache2-mod-php5.
  Preparing to unpack .../libapache2-mod-php5_5.5.9+dfsg-1ubuntu4.7_amd64.deb ...
  Unpacking libapache2-mod-php5 (5.5.9+dfsg-1ubuntu4.7) ...
  Preparing to unpack .../php5_5.5.9+dfsg-1ubuntu4.7_all.deb ...
  Unpacking php5 (5.5.9+dfsg-1ubuntu4.7) over (5.5.9+dfsg-1ubuntu4.6) ...

  Other requested information:

  $ lsb_release -rd
  Description:    Ubuntu 14.04.2 LTS
  Release:        14.04

  $ apt-cache policy unattended-upgrades
  unattended-upgrades:
    Installed: 0.82.1ubuntu2.1
    Candidate: 0.82.1ubuntu2.1
    Version table:
   *** 0.82.1ubuntu2.1 0
          500 http://ubuntu.orion.retrosnub.co.uk/ubuntu/ trusty-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       0.82.1ubuntu2 0
          500 http://ubuntu.orion.retrosnub.co.uk/ubuntu/ trusty/main amd64 Packages

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