Looking back over your posts, it seems that you are working on a Maverick system. I mistakenly thought you were asking about Lucid, so I'm not sure that this will work for you. It seems that Ubuntu support for Maverick has expired, so you should probably upgrade the entire system, or you might want to wait till the end of the month when 12.04 LTS (Precise Pangolin) is released.
For what it's worth, Flash 18.104.22.168 works fine on my 64-bit Oneiric system.
I'll leave this here for any 10.04 LTS (Lucid) users who lost all Flash functionality after the update.
You don't seem to have any copies of flash anyplace in your /usr directory, so it seems that for some reason none of your attempts have resulted in a proper installation. I don't think any of those copies scattered around in your /home directory are a problem. My only concern is that I don't know anything about flash-aid and it seems to have tried to install flash in /usr/lib/kde4 which is a non-standard location for it, in ubuntu 10.04 at least. And yet that somehow ended up in your home directory too, so I'm wondering if there's a link somewhere that we haven't detected that may be pointing to that ...
Anyway here's my advice. I can't guarantee that it will work because some of your other attempts may have left behind some garbage that this won't clean up. But this won't break your system. At worst, you'll end up still without flash -- but that's no worse than where you are now. It won't hurt anything else. I can tell you that this worked perfectly on my 10.04 LTS machine.
First maybe you should remove, or at least disable, flash-aid. I don't know what it does, it's not a standard Ubuntu thing and I don't see why you need it. After this process is finished (assuming it's successful) you don't want to be making any further changes to the flash plugin anyway. So (in Firefox) go to Tools/Add-ons/Plugins, find flash-aid and click disable. Then quit and restart Firefox.
(Apologies to the flash-aid developers. I just don't like turning my baby over to a "wizard"; I'd rather run a few simple commands and know exactly what's being done to my system.)
go to this link (that's the same link that philinux posted earlier) http://ubuntu.wbac.ac.th/archive-can...ucid1_i386.deb and save that file to your Desktop.
Open a terminal window. The remaining steps will all be done at the command line.
Run this command
That should get rid of anything remaining from the non-working flashplugin version 11.2...
sudo apt-get purge flashplugin-installer
Run this command
That will probably do nothing because I don't think you've ever installed that package, but run it just in case. It can't hurt anything.
sudo apt-get purge adobe-flashplugin
That will save a copy of the .deb file that you just downloaded in your apt archives.
sudo cp ~/Desktop/adobe-flashplugin_22.214.171.124* /var/cache/apt/archives/
Now we install it:
At this point, you should have a working flash plugin. I'm not sure, you might have to restart Firefox again to get it to use the new plugin.
sudo gdebi /var/cache/apt/archives/adobe-flashplugin_126.96.36.199*
Now, we "lock" this version, so your package manager doesn't come along next week and "helpfully" replace it with another non-working update.
Note there's that vertical bar again in the middle of the command line.
echo "adobe-flashplugin hold" | sudo dpkg --set-selections
Finally, now that flash is working again (hopefully), you can delete all the various copies of it that are scattered around in your home directory -- all the ones listed in post #71, and the new one we just downloaded to your Desktop. Leave the one that we copied to /var/cache/apt/archive. That's all you need.