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LUKS encrypted file systems have been natively supported in most Linux distros for 5+ years. These encrypted file systems can be easily created on the command line or with a GUI tool like "gnome-disks". If you, for example, insert a thumb drive formated as a LUKS, the desktop environment pops up a password dialog to automatically mount the file system for you.

TrueCrypt mainly catered to Windows users. Also, the TrueCrypt license was incompatible with both the free-software and the Open Source Initiative philosophies.