how can I revert to previous version of flash?

Solution 1:

Here is the fix:

1. Close running instances of your browser.

2. If you don't already have synaptic package manager installed (it isn't by default) install it. From the terminal type:

   sudo apt-get install synaptic
   

3. You will also need to install "hal" and "hal-info", unless already installed:

   sudo apt-get install hal hal-info
   

4. Start Synaptic Package Manager
5. In the top right of the application is a search box. Search for "flashplugin-installer"
6. Highlight the package and press Ctrl + E
7. The "Force version" window should open
8. Pick version 11.2.202.243 instead of the currently installed 11.2.202.280
9. Apply changes by clicking the button that says "Apply" with a check mark under it.
10. With the package still highlighted, select from the top menu: Package->Lock Version
11. Close Synaptic and open a terminal

12. We need to remove old cached versions of the plugin. First type:

     cd ~/.adobe/Flash_Player
    

13. Next type:

     rm -rf NativeCache AssetCache APSPrivateData2
    

14. You can now close the terminal and reopen your browser

Thanks to Rob S for the instructions on how to do this. The above instructions are his with only slight modifications. Additionally, the last few instructions are from the Arch Linux Wiki.