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If I want to run Ubuntu Server on a Raspberry Pi4 can I encrypt the SD card like an encrypted disk? If not is the next best thing to encrypt the home directory?

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Yes encryption is supported.

However, the Pi4 bootloader cannot currently (late 2021) handle the normal Ubuntu Server installer. You must install LUKS and run cryptsetup manually after booting your newly-flashed system.

If you don't know how LUKS and cryptsetup work, review a few tutorials and perhaps practice in a VM before encrypting your real system.

Reminder: If booting from an SD card, recall that they wear out. The moment the SD card dies your encrypted data becomes forever inaccessible unless you are prepared.

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