Installing ThinkOrSwim trading application under Ubuntu
1: Install Oracle-java-jdk7
Follow the tutorial here - http://www.webupd8.org/2012/01/install-oracle-java-jdk-7-in-ubuntu-via.html
2: Download the Installer here - https://mediaserver.thinkorswim.com/installer/InstFiles/thinkorswim_installer.sh
3: Install: Make the script executable – right click on the file choose properties from the menu and tick the box as shown below. Note the location of the file. In this case it's in my Downloads folder.

Now we are ready to install.
Open a Terminal with CtrlAltT and we will make a folder for installation
mkdir opt
cd ~
change to the folder where you downloaded the installer. In my case I'll type “cd Down” and hit the tab key then enter.
ls shows the contents of the folder. Enter the following:
sh thinkorswim_installer.sh

click Next. I always suggest reviewing privacy policies to insure you can accept them.

To continue choose I accept and click next.
Browse to the directory you have created.
My case is below:

Click OK:

Click Next:

Click Next:
Click Finish – Think or Swim will run
For now you can hit cancel at the logon screen. Type exit at any open terminal windows to close them. You'll find a shortcut on your desktop as shown below.

Right click – choose properties - click the permissions tab and tick the box to allow execution.
You can now run think or swim from the desktop icon. Expect a wait for installing updates. For assistance with the application contact TDAmeritrade.
thinkorswim? What do you get when you typethinkorswimon a terminal. Press Ctrl+ Alt+t to open a terminal.