Okay, firstly, did you follow this advice when you first created your bootable media which might be the cause of your sorrows?:
Secondly, did you do a full system update and run any fix commands?:
The terminal commands (Ctrl + Alt + t) in question are the following:
sudo apt-get --fix-missing install
The above command downloads and installs any missing packages on your system.
sudo apt-get --fix-broken install
The above command downloads and installs any broken dependencies on your system.
For a fresh install and keeping your data intact which should overwrite any .config files: