VPN
Run Your Own WireGuard VPN Server on Ubuntu
WireGuard's strength is that it does one thing and does it well. The configuration fits on an index card.
Linux
Stop Trusting Your Email to Corporations: Set Up Your Own Mail Server with S/MIME Encryption
Proton Mail handed payment data to the FBI to unmask a protestor. The email was encrypted — the business relationship wasn't.
Build
Build a Secure IKEv2 VPN Server on Linux
Build a private IKEv2 VPN server you can use to protect your traffic from inspection by a local provider.