Install gtest in Ubuntu

install_gtest_ubuntu.md

Reference - https://www.eriksmistad.no/getting-started-with-google-test-on-ubuntu/

sudo apt-get install libgtest-dev

sudo apt-get install cmake # install cmake

cd /usr/src/gtest

sudo cmake CMakeLists.txt

sudo make

sudo cp *.a /usr/lib

sudo ln -s /usr/lib/libgtest.a /usr/local/lib/gtest/libgtest.a

sudo ln -s /usr/lib/libgtest_main.a /usr/local/lib/gtest/libgtest_main.a

@georgegoldman I can't see the photo you uploaded, but I reckon your error relates to this:
Apparently, libgtest* files will be stored inside the lib directory so instead, you should run
sudo cp lib/libgtest* /usr/lib/

I combined all the answers above and minorly modified it, it worked on GitHub actions with -ubuntu-latest as well.

sudo apt-get install -y libgtest-dev cmake
mkdir -p $HOME/build
cd $HOME/build
sudo cmake /usr/src/googletest/googletest
sudo make
sudo cp lib/libgtest* /usr/lib/
cd ..
sudo rm -rf build
sudo mkdir /usr/local/lib/googletest
sudo ln -s /usr/lib/libgtest.a /usr/local/lib/googletest/libgtest.a
sudo ln -s /usr/lib/libgtest_main.a /usr/local/lib/googletest/libgtest_main.a

Thanks! Works like awesome.