[ubuntu] SSD, Trim & Full Disk Encryption

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http://ubuntuforums.org – I installed Ubuntu 12.04 using the alternate install image onto an 120GB SSD. during install i created a boot partition and a encrypted partition (Extended) containing the root file system and home directory. Question: As its an SSD i want to enable 'TRIM', with the possible complication of and extended encrypted partition is this still as simple as adding the 'TRIM' argument in the 'fstab' file or is their a further process i need to go through? Thanks If you feel that you require further information please ask. (Hardware)