Hello everyone!
Encrypting your disk is worthy since it protects your information from unauthorized users.
Which is why I have 2 #foss options below!
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1. VeraCrypt
Features: Derived from TrueCrypt | Easy to use | Full disk encryption (FDE) |
Site: https://frama.link/Veracrypt
For: 
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2. Linux Unified Key Setup
Features: FDE | Uses dm-crypt | Included by in Ubuntu |
Site: https://frama.link/luks
For:
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Stay Safe!