If you've been looking for an application to flash your Samsung Android devices with Ubuntu - you may want to give Heimdall a shot. Heimdall is a cross-platform (Linux / OSX /  Windows) open-source tool suite used to flash firmware onto Samsung Galaxy S devices.
Known works with these devices :

• International GT-I9000.
• Galaxy S GT-I9000 (8 GB)
• Galaxy S GT-I9000 (16 GB)
• Captivate
• Vibrant
• Fascinate
• Mesmerize
• Epic 4G
• Galaxy S 4G
• Infuse 4G
• GT-I9000T
• Galaxy Tab (7 and 10.1 inches)
• Galaxy S II 

I have installed it in Ubuntu 12.04 Precise Pangolin (32 bit), the application itself apparently works fine but I haven't flash any devices (yet).

Download and install these two files from above link :

• heimdall_1.3.2_i386.deb
• heimdall-frontend_1.3.2_i386.deb

If the shortcut is not automatically created, you have to launch it manually via terminal with heimdall-frontend command.

update : get the 64 bit version here :
http://forum.xda-developers.com/showpost.php?p=25364150&postcount=164

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