[Bug 130519] Re: selects Teletype frontend on non-ttys

[Henrik Heimbuerger]

I don't really know what that does, but DEBIAN_FRONTEND=noninteractive
seems to get rid of the warnings and that's exactly what I was looking
for. ;)

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https://bugs.launchpad.net/bugs/130519

Title:
  selects Teletype frontend on non-ttys

Status in “debconf” package in Ubuntu:
  Triaged

Bug description:
  Binary package hint: debconf

  Since July 17th, Gutsy's debconf complain when apt-get is run within a
  script:

  # /usr/bin/apt-get -q -y -u upgrade
  Reading package lists...
  Building dependency tree...
  Reading state information...
  The following packages will be upgraded:
    apt apt-utils binutils dhcp3-client dhcp3-common dpkg dpkg-dev e2fslibs
    e2fsprogs gcc-4.2-base libblkid1 libc6 libc6-dev libc6-i686 libcomerr2
    libcurl3-gnutls libdevmapper1.02.1 libgcc1 libss2 libstdc++6 libuuid1
    libvolume-id0 linux-libc-dev perl perl-base perl-modules python2.5
    python2.5-minimal udev vim-common vim-tiny volumeid
  32 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
  Need to get 4258kB/28.3MB of archives.
  After unpacking 20.5kB of additional disk space will be used.
  Get:1 http://archive.ubuntu.com gutsy/main python2.5 2.5.1-1ubuntu4 [3090kB]
  Get:2 http://archive.ubuntu.com gutsy/main python2.5-minimal 2.5.1-1ubuntu4 [1168kB]
  debconf: unable to initialize frontend: Dialog
  debconf: (Dialog frontend will not work on a dumb terminal, an emacs shell buffer, or without a controlling terminal.)
  debconf: falling back to frontend: Readline
  debconf: unable to initialize frontend: Readline
  debconf: (This frontend requires a controlling tty.)
  debconf: falling back to frontend: Teletype
  dpkg-preconfigure: unable to re-open stdin: 
  Fetched 4258kB in 0s (9401kB/s)
  (Reading database ... 12243 files and directories currently installed.)
  Preparing to replace dpkg 1.14.4+svn20070602r802-0ubuntu3 (using .../dpkg_1.14.5ubuntu1_i386.deb) ...
  Unpacking replacement dpkg ...
  Setting up dpkg (1.14.5ubuntu1) ...

  It worked up to July 17th, now it's broken.
  100% reproducible.

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