# install packages
sudo -H -E apt -y -q=3 install ${PKG_LIST[@]}
+# If you have a issue with Let's Encrypt certificate when cloning repo due to DST Root CA X3 Expiration:
+# https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/
+# remove outdated certificate from system
+sudo rm -rf /usr/share/ca-certificates/mozilla/DST_Root_CA_X3.crt
+# update ca-certificates
+sudo update-ca-certificates --fresh --verbose
+
# remove unnecessary packages
sudo -H -E apt autoremove -y