install-gnome.sh

#!/bin/sh

# Known issues:
#  - graphic bugs while you open pop-de
# 
# Please, create recovery usb before installing it.
# You're using it on your own risk.
# BTW. it works on my computer.
# 
# Remember to set GNOME DE on login screen and set pop's default themes with gnome-tweaks after installation.

echo "---"
echo "WARNING!"
echo "THIS UPDATE MAY BE UNSTABLE.  USE IT ON YOUR OWN RISK!\n"
echo "PREPARE RECOVERY USB BEFORE INSTALLING IT."
echo "IF YOU DON'T WANT TO INSTALL THIS UPDATE, CLICK CTRL+C OR WRITE \"n\" RIGHT NOW!"
echo "BUT IF YOU WANT TO PROCEED JUST WRITE \"y\""
echo "---"

read ans
if [ $ans != "y" ]; then
        exit 2
fi;

# adding gnome 40 repo
sudo add-apt-repository ppa:shemgp/gnome-40

# replacing the repo version to the 21.04
sudo sed -i 's/groovy/hirsute/' /etc/apt/sources.list.d/*gnome-40*
sudo sed -i 's/groovy/hirsute/' /etc/apt/sources.list.d/system.sources

# prevent downgrading gnome
sudo rm -f /etc/apt/preferences.d/pop-default-settings

sudo apt update
sudo apt upgrade -y --allow-downgrades

sudo apt install -y libc6 libhandy-1-dev mutter=40.0-0shemgpubuntu6 gnome-shell-common=40.0-0shemgpubuntu3 gnome-shell=40.0-0shemgpubuntu3 gnome-session gnome-tweaks=40.0-0shemgpubuntu2 gnome-shell-extension-prefs=40.0-0shemgpubuntu3 fonts-cantarell

echo "---"
echo "If everything went well, you should see gnome-shell version 40 below.\n"
gnome-shell --version
echo "\nNow you can reboot system, remember to select \"GNOME\" option on your login screen in right down bottom."
echo "Hope everything will work :)"
echo "\nAfter installing use gnome-tweaks to set appearance to pop's defaults."

Did you changed it to "May be unstable" because it had an fix update or something?

I did change it to "may be unstable", because i won't update it anymore and on newer versions of PopOS it may not work.