Bug#757524: steam: preseeding debconf settings fails install

[Anthony F McInerney]

Package: steam
Version: 1.0.0.48-1
Severity: normal

Dear Maintainer,

debconf-get-selections | grep steam
debconf: DbDriver "passwords" warning: could not open
/var/cache/debconf/passwords.dat: Permission denied
steam   steam/license   note
steam   steam/purge     note
steam   steam/question  select  I AGREE

bofh80 at d630:~$ sudo apt install steam
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  steam:i386
0 upgraded, 1 newly installed, 0 to remove and 2 not upgraded.
Need to get 0 B/874 kB of archives.
After this operation, 2,722 kB of additional disk space will be used.
Preconfiguring packages ...
Selecting previously unselected package steam.
(Reading database ... 178762 files and directories currently installed.)
Preparing to unpack .../steam_1.0.0.48-1_i386.deb ...
dpkg: error processing archive
/var/cache/apt/archives/steam_1.0.0.48-1_i386.deb (--unpack):
 subprocess new pre-installation script returned error exit status 30
Installation terminated: Steam License Agreement was DECLINED.
Errors were encountered while processing:
 /var/cache/apt/archives/steam_1.0.0.48-1_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

Please advise if this can be fixed.
Thanks
Anthony F McInerney (bofh80)



-- System Information:
Debian Release: jessie/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.14-2-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages steam depends on:
ii  debconf [debconf-2.0]                 1.5.53
ii  libc6                                 2.19-7
ii  libgl1-mesa-dri                       10.2.4-1
ii  libgl1-mesa-glx                       10.2.4-1
ii  libstdc++6                            4.9.1-4
ii  libtxc-dxtn-s2tc0 [libtxc-dxtn0]      0~git20131104-1.1
ii  libudev1                              208-6
ii  libx11-6                              2:1.6.2-2
ii  libxinerama1                          2:1.1.3-1
ii  lxterminal [x-terminal-emulator]      0.1.11-4
ii  mrxvt [x-terminal-emulator]           0.5.4-1.1
ii  multiarch-support                     2.19-7
ii  terminology [x-terminal-emulator]     0.6.1-1
ii  xfce4-terminal [x-terminal-emulator]  0.6.3-1
ii  xterm [x-terminal-emulator]           308-1
ii  xz-utils                              5.1.1alpha+20120614-2

Versions of packages steam recommends:
ii  fonts-liberation  1.07.4-1
ii  zenity            3.12.1-1.1

steam suggests no packages.

-- debconf information:
  steam/purge:
* steam/question: I AGREE
* steam/license: