The `protoc` ProtoBuf most be installed, currently version `3.21.12` is being used: https://github.com/protocolbuffers/protobuf/releases/tag/v21.12 The versioning is rather confusing, described here: https://protobuf.dev/support/version-support/ Most likely you want [https://github.com/protocolbuffers/protobuf/releases/download/v21.12/protoc-21.12-linux-x86_64.zip](https://github.com/protocolbuffers/protobuf/releases/download/v21.12/protoc-21.12-linux-x86_64.zip) Very summary installation instructions are in an enclosed `readme,txt` file. You can try to install from `apt` on Ubuntu, but you have no control on what exact version you are getting: ```shell sudo apt install protobuf-compiler ``` Also install the following `protoc` plugins: ```shell go install google.golang.org/protobuf/cmd/protoc-gen-go@v1.30.0 go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@v1.3.0 go install github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway@v2.18.0 ``` In order to rebuild the ProtoBuf interfaces, in case you make changes to any of the `*.proto` files, run `make` in this folder.