Some useful commands for Ubuntu
To Remove Package:
1. To see list of installed packages in chronological order
2. Pick what you wish to uninstall and execute
3. Clean up package from archives
To Install Gnome Classic:
1. To see list of installed packages in chronological order
grep install /var/log/dpkg.log
2. Pick what you wish to uninstall and execute
sudo apt-get remove package-name
3. Clean up package from archives
sudo apt-get clean
To Install Gnome Classic:
sudo apt-get update; sudo apt-get install gnome-session-fallback
