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I downloaded avast! and have avast4workstation_1.3.0-2_i386.deb as the downloaded file. What do I do next to finish installation?

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Graphical way

  1. Double click the file. It should open in the Ubuntu Software Centre.
  2. Click the 'Install' button near the top right corner.
  3. Type your account password if required.
  4. Wait for it to be installed.
  5. Run it from the Dash.

Command-line way

Do the following (from Goldentoa11's comment):

  1. Open a terminal (Ctrl+Alt+T).
  2. Execute the following command (substituting the correct path to the file):

    dpkg -i "/path/to/file.deb"

For future reference, all files ending in .deb can be installed either way.

Note: As said in the comments, you'll need a serial number from the avast! website first.

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Addition: In the case of Avast, you also have to register on their site to get a serial number. – Scott Goodgame Sep 28 '13 at 1:40
Also, if you prefer the terminal, you can run dpkg -i debname.deb – Goldentoa11 Sep 28 '13 at 2:40

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