Problems with upgrade from Ubuntu Dapper to Edgy (dpkg failure messages)

Thought someone might benifit from my experiences, as to day I upgraded my Dapper box to Edgy.
I started by just editing the /etc/apt/sources.list and changing all dapper entries to edgy.

Then the the following problems started to show up and this is how I fixed them:

# this ran fine.
#
$ sudo aptitude update

# this failed with errors about too many failed dpkg 
# subprocesses and gave me a huge list of failing to 
# configure python-* packages and diverse misc packages.
#
$ sudo aptitude dist-upgrade

# next I tried to fix one of the failing packages:
#
$ sudo dpkg --force-depends --force-overwrite --configure python-imaging
Setting up python-imaging (1.1.5-10build1) ...
pycentral: pycentral pkginstall: already exists: 
/usr/lib/python2.4/site-packages/PIL/__init__.py
pycentral pkginstall: already exists: 
/usr/lib/python2.4/site-packages/PIL/__init__.py
dpkg: error processing python-imaging (--configure):
subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
python-imaging

# the fix is to remove the offending section in site-packages 
# and then rerunning the configure line above.
#
$ sudo rm -rf /usr/lib/python2.4/site-packages/PIL/*
$ sudo dpkg --force-depends --force-overwrite --configure python-imaging
Setting up python-imaging (1.1.5-10build1) ...

# now that worked for all but the acpid package which 
# gave this error message:
#
$ sudo dpkg --force-depends --force-overwrite --configure -a
Setting up acpid (1.0.4-5ubuntu4) ...
* Loading ACPI modules...
...done.
* Starting ACPI services...
invoke-rc.d: initscript acpid, action "start" failed.
dpkg: error processing acpid (--configure):
subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
acpid

# solution:
$ sudo killall acpid
$ sudo dpkg --force-depends --force-overwrite --configure -a
Setting up acpid (1.0.4-5ubuntu4) ...
* Loading ACPI modules...
...done.
* Starting ACPI services...
...done.

# finished off now with a final dist-upgrade and done!