I tried the below commands on Google Cloud Shell as per this document reference and I was able to install GCSFuse successfully.
Add the gcsfuse distribution URL as a package source and import its public key using :
export GCSFUSE_REPO=gcsfuse-`lsb_release -c -s`
echo "deb http://packages.cloud.google.com/apt $GCSFUSE_REPO main" | sudo tee /etc/apt/sources.list.d/gcsfuse.list
curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
Update the list of packages available and install gcsfuse using :
sudo apt-get update
sudo apt-get install gcsfuse
(Ubuntu before wily only) Add yourself to the fuse group, then log out and back in using :
sudo usermod -a -G fuse $USER
exit
I also found a line in this document which says “The following instructions set up apt-get to see updates to gcsfuse, and are supported for the bionic, artful, zesty, yakkety, xenial, and trusty releases of Ubuntu, and the jessie and stretch releases of Debian. (Run lsb_release -c to find your release codename.) Users of older releases should follow the instructions for other distributions below.
So you should also try and find the release codename first. If you are a user of an older release then these commands might not work for you. For that, follow the instructions/commands of installing older distributions, which is clearly differentiated and specified in this document link