libferret.so overwrite attempt - libgail-common versus libgtk2.0-0

Binary package hint: libgail-common

This is the tail end of a troublesome attempt to try out Intrepid (alpha 5 I think) as grabbed from repositories today.

Previous installation was Gutsy and upgrade is now almost complete but with package state not quite ideal as the end of this bug report will detail

dpkg --install libgail-common_1.22.3-1_i386.deb
(Reading database ... 157234 files and directories currently installed.)
Unpacking libgail-common (from libgail-common_1.22.3-1_i386.deb) ...
dpkg: error processing libgail-common_1.22.3-1_i386.deb (--install):
 trying to overwrite `/usr/lib/gtk-2.0/modules/libferret.so', which is also in package libgtk2.0-0
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
 libgail-common_1.22.3-1_i386.deb
: #root@1i14z512(archives) ;dpkg -l | egrep '(libgail|libgtk2)'
ii libgail-gnome-module 1.20.0-1ubuntu1 GNOME Accessibility Implementation Module fo
ii libgail18 1.22.3-1 GNOME Accessibility Implementation Library -
ii libgtk2-perl 1:1.183-1 Perl interface to the 2.x series of the Gimp
ii libgtk2.0-0 2.14.1-0ubuntu1 The GTK+ graphical user interface library
ii libgtk2.0-bin 2.14.1-0ubuntu1 The programs for the GTK+ graphical user int
ii libgtk2.0-cil 2.12.1-1ubuntu2 CLI binding for the GTK+ toolkit 2.12
ii libgtk2.0-common 2.14.1-0ubuntu1 Common files for the GTK+ graphical user int

Here is the contents of /etc/lsb-release which still refers to the previous installation [Gutsy]
: #root@1i14z512(archives) ;cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=7.10
DISTRIB_CODENAME=gutsy
DISTRIB_DESCRIPTION="Ubuntu 7.10"

Here is a clue to the not quite ideal package state but I am about to reboot and am fairly confident that Intrepid will work okay but
the package state will need some attention before I can enable automatic updates.
: #root@1i14z512(archives) ;aptitude -s safe-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initialising package states... Done
The following packages have unmet dependencies:
  libterm-readline-gnu-perl: Depends: perlapi-5.8.7 which is a virtual package.
  libgtkhtml3.8-15: Depends: libgail-common (>= 1.10.1) which is a virtual package.
  nautilus: Depends: libgail-common (>= 1.10.1) which is a virtual package.
  libxml-libxml-common-perl: Depends: perlapi-5.8.8 which is a virtual package.
  doc-base: Depends: libmldbm-perl but it is not installable
  libmono-corlib1.0-cil: Depends: mono-jit (< 1.2.5) but 1.9.1+dfsg-3ubuntu2 is installed.
  gtk2-engines-pixbuf: Depends: libgtk2.0-0 (= 2.12.0-1ubuntu3) but 2.14.1-0ubuntu1 is installed.
  firestarter: Depends: libgail-common (>= 1.10.1) which is a virtual package.
  libgnome2-perl: Depends: perlapi-5.8.7 which is a virtual package.
  libterm-readkey-perl: Depends: perlapi-5.8.8 which is a virtual package.
  python-apt: Depends: libapt-inst-libc6.8-6-1.1 which is a virtual package.
  apt-utils: Depends: libapt-pkg-libc6.6-6-4.5 which is a virtual package.
  gnome-utils: Depends: libgail-common (>= 1.10.1) which is a virtual package.
  nautilus-cd-burner: Depends: libgail-common (>= 1.10.1) which is a virtual package.
  libgnome2-vfs-perl: Depends: perlapi-5.8.7 which is a virtual package.
  python-uno: Depends: openoffice.org-core (= 1:2.3.0-1ubuntu5.4) but 1:2.4.1-8ubuntu1 is installed.
  libxml-libxml-perl: Depends: perlapi-5.8.8 which is a virtual package.
  libmono-system-web2.0-cil: Depends: mono-jit (< 1.2.5) but 1.9.1+dfsg-3ubuntu2 is installed.
  libgtkhtml2-0: Depends: libgail-common (>= 1.10.1) which is a virtual package.
  libmono-corlib2.0-cil: Depends: mono-jit (< 1.2.5) but 1.9.1+dfsg-3ubuntu2 is installed.
  mono-runtime: Depends: mono-jit (= 1.2.4-6ubuntu6.1) but 1.9.1+dfsg-3ubuntu2 is installed.
  synaptic: Depends: libapt-pkg-libc6.6-6-4.5 which is a virtual package.
  libeel2-2: Depends: libgail-common (>= 1.10.1) which is a virtual package.
  libgtk2.0-0: Conflicts: libgail18 but 1.22.3-1 is installed.
  libmono-system2.0-cil: Depends: mono-jit (< 1.2.5) but 1.9.1+dfsg-3ubuntu2 is installed.

The output of dpkg -l is attached with extension .dpkl