Hello I am new to Ubuntu. I Installed a bunch of softwares like Android Studio and JDK and other stuff. Now my ubuntu is messed up and It doesn't show the login screen and when I start lightdm and put my password it does not login to my desktop. (this happened after messing with my graphic driver and installing Nvidia graphic driver I think) So I want to wipe linux cause I do not care about the OS but I want to keep settings that I did for Android (path and etc.) and also I want to back up my software so I can easily recover them on the fresh Ubuntu that I am going to install. I know I my question has many parts. What is the solution for keeping the settings , backing up the softwares (but not the graphic driver) and wiping out the Ubuntu.