Flash 10 failed on load and locked up further load/unload action

I Updated to Ubuntu 9.10, Karmic Koala, as soon as I was notified by the Update Manager that it was available from the previously installed 9.04.
The Immediate result was Firefox 3.5.4 browser and tabs then would load painfully slowly.
As soon as Firefox 3.5.5 appeared on the Update Mgr, I upgraded.
I was then advised that my version of Flash would become unstable and recommended Flash 10 be installed.
I proceeded as instructed, the installation failed mid-way. I have no flash, can't reinstall or uninstall. Flash files exist in the system, but only one can be seen by the Computer Janitor (as unused) but cannot be removed. Is there a Flash removal or cleanup tool that is available for easy processing back to ground zero? I am not very adept at system file manipulation and frankly am not well aquainted with geek speak,so I'm afraid I can only follow novice instructions.

Thank you all in advance for your kind consideration of my problem.
Tonamator

Details of computer dialog are as follows:

Ubuntu 9.10 - the Karmic Koala

Firefox, version 3.5.5
   Ubuntu canonical - 1.0

Flash_player_10_linux.deb

Package Installer:
    gdebi-gtk
    Could not open 'install_flash_player_10_linux.deb'
    The package might be corrupted or you are not
    allowed
    open the file. Check the permissions of the file.
*I opened permissions and tried various alterations after downloading file multiple times

Computer Janitor:
*adobe-flash plugin listed as unused
    Remove packages command:
        Could not clean up properly
 E:Sub-process /usr/bin/dpkg returned an error code (1)

Synaptic Package Manager:
    E: The package adobe-flashplugin needs to be
    reinstalled, but I can't find an archive for it.
    E: Internal error opening cache (1). Please report.
*SPM now blocked from further usage.

Update Manager:
    Not all updates can be installed
    Run a partial upgrade, to install as many updates as possible. This can be caused by:
    >A previous upgrade which didn't complete.
    >Problems with some of the installed software.
    >Unofficial software packages not provided by Ubuntu.
    >Normal changes of a pre-release version of Ubuntu.

Remove package in bad state

The package 'adobe-flashplugin' is in an inconsistent state and needs to be reinstalled, but no archive can be found for it. Do you want to remove this package now to continue?

Package in inconsistent state

The package 'adobe-flashplugin' is in an inconsistent state and needs to be reinstalled, but no archive can be found for it. Please reinstall the package manually or remove it from the system.

An error ocurred, please run Package Manager from the right-click menu or apt-get in a terminal to see what is wrong. The error message was: 'Unknown Error:'<type 'exceptions.SystemError'>'(E:The package adobe-flashplugin needs to be reinstalled,but I can't find an archive for it.)'This usually means that your installed packages have unmet dependencies

apt 0.7.23.1ubuntu2 for i386 compiled on Oct 15 2009 19:23:21
Usage: apt-get [options] command
       apt-get [options] install|remove pkg1 [pkg2 ...]
       apt-get [options] source pkg1 [pkg2 ...]

apt-get is a simple command line interface for downloading and
installing packages. The most frequently used commands are update and install.

Commands:
   update - Retrieve new lists of packages
   upgrade - Perform an upgrade
   install - Install new packages (pkg is libc6 not libc6.deb)
   remove - Remove packages
   autoremove - Remove automatically all unused packages
   purge - Remove packages and config files
   source - Download source archives
   build-dep - Configure build-dependencies for source packages
   dist-upgrade - Distribution upgrade, see apt-get(8)
   dselect-upgrade - Follow dselect selections
   clean - Erase downloaded archive files
   autoclean - Erase old downloaded archive files
   check - Verify that there are no broken dependencies

Options:
  -h This help text.
  -q Loggable output - no progress indicator
  -qq No output except for errors
  -d Download only - do NOT install or unpack archives
  -s No-act. Perform ordering simulation
  -y Assume Yes to all queries and do not prompt
  -f Attempt to correct a system with broken dependencies in place
  -m Attempt to continue if archives are unlocatable
  -u Show a list of upgraded packages as well
  -b Build the source package after fetching it
  -V Show verbose version numbers
  -c=? Read this configuration file
  -o=? Set an arbitrary configuration option, eg -o dir::cache=/tmp
See the apt-get(8), sources.list(5) and apt.conf(5) manual
pages for more information and options.
                       This APT has Super Cow Powers.