Preparing to replace default-jre-headless 1.6-34 (using .../default-jre-headless_1%3a1.6-43ubuntu2_i386.deb) ...
Unpacking replacement default-jre-headless ...
dpkg: error processing /var/cache/apt/archives/default-jre-headless_1%3a1.6-43ubuntu2_i386.deb (--unpack):
 trying to overwrite '/usr/lib/jvm/java-1.6.0-openjdk', which is also in package openjdk-6-jre-headless 6b24-1.11.4-1ubuntu0.10.04.1
dpkg: regarding .../openjdk-6-jre-headless_6b24-1.11.4-1ubuntu0.12.04.1_i386.deb containing openjdk-6-jre-headless:
 openjdk-6-jre-headless conflicts with default-jre-headless (<< 1.6-43~)
  default-jre-headless (version 1.6-34) is present and installed.
dpkg: error processing /var/cache/apt/archives/openjdk-6-jre-headless_6b24-1.11.4-1ubuntu0.12.04.1_i386.deb (--unpack):
 conflicting packages - not installing openjdk-6-jre-headless
Selecting previously unselected package libapt-pkg-perl.
Unpacking libapt-pkg-perl (from .../libapt-pkg-perl_0.1.25build2_i386.deb) ...
Selecting previously unselected package apt-show-versions.
Unpacking apt-show-versions (from .../apt-show-versions_0.17_all.deb) ...
Unpacking dovecot-core (from .../dovecot-core_1%3a2.0.19-0ubuntu2_i386.deb) ...
dpkg: error processing /var/cache/apt/archives/dovecot-core_1%3a2.0.19-0ubuntu2_i386.deb (--unpack):
 trying to overwrite '/etc/init.d/dovecot', which is also in package dovecot-common 1:2.0.19-0ubuntu2