How to Install Protobuf on Ubuntu 20.04

protobuf-ubuntu-20-04.md

1. sudo apt-get install autoconf automake libtool curl make g++ unzip -y
2. Download the appropriate release here:
https://github.com/protocolbuffers/protobuf/releases/tag/v3.5.1 <protobuf-all-3.5.1.tar.gz
>
3. Unzip the folder
4. Enter the folder and run ./autogen.sh && ./configure && make
5. Then run these other commands. They should run without issues:
$ make check
$ sudo make install
$ which protoc
$ sudo ldconfig
$ protoc --version

@mikelemo

Follow these steps to install the Protocol Buffers compiler (protoc) version 24.4:

wget https://github.com/protocolbuffers/protobuf/releases/download/v24.4/protoc-24.4-linux-x86_64.zip  
unzip protoc-24.4-linux-x86_64.zip -d protoc-24.4  
sudo mv protoc-24.4/bin/protoc /local/bin/  
sudo mv protoc-24.4/include/* /local/include/  
protoc --version

If you still get an error when running protoc --version, try copying the binary to /bin

cd /local/bin  
sudo cp protoc /bin