error in downloaded file

Can you give the output of:

sudo apt-get clean; sudo apt-get update && sudo apt-get -y upgrade

Thanks

Hello, as I'm not very good on computers I don't know how to this. Can you make it simpler please?

Open a Terminal from the menu Applications->Accessories->Terminal

**Tip: right click with mouse on the top terminal windows title caption and select the menu item "Always on Top"
doing this you will force the terminal window to stay on top of the other windows and you will find very easy
to copy single row from this web page into the terminal...
Something more about using the terminal https://help.ubuntu.com/community/UsingTheTerminal

Then type or better copy and paste a row a time then press enter:
(Tip: select the single row to copy from this page then right click and select copy then click into the terminal window
and to quick paste click with middle button of mouse )

Copy and paste the rows below, copy and paste one row a time (see the **Tip) then press enter:

sudo dpkg --configure -a
sudo apt-get -f install
sudo apt-get --fix-missing install
sudo apt-get update
sudo apt-get dist-upgrade
sudo apt-get clean
sudo apt-get autoremove
sudo apt-get update

give your user password when requested, you don't see nothing when you type it, then press enter.

Hope this helps

Hello, I did as you told me and tried to download shockwave and the message below popped up. I've no idea what it's on about. It's even baffled my experienced computer user son. Thanks.

Archive: /home/voovon/Downloads/Shockwave_Installer_Full.exe
[/home/voovon/Downloads/Shockwave_Installer_Full.exe]
  End-of-central-directory signature not found. Either this file is not
  a zipfile, or it constitutes one disk of a multi-part archive. In the
  latter case the central directory and zipfile comment will be found on
  the last disk(s) of this archive.
zipinfo: cannot find zipfile directory in one of /home/voovon/Downloads/Shockwave_Installer_Full.exe or
          /home/voovon/Downloads/Shockwave_Installer_Full.exe.zip, and cannot find /home/voovon/Downloads/Shockwave_Installer_Full.exe.ZIP, period.

Shockwave doesn't run on Linux. It is a windows only app. If you need shockwave you will need to run a windows browser in wine and maybe it will work.