A new version (/etc/apt/apt.conf.d/50unattended-upgrades.ucftmp) of   │
   │ configuration file /etc/apt/apt.conf.d/50unattended-upgrades is       │
   │ available, but the version installed currently has been locally       │
   │ modified.                                                             │
   │                                                                       │
   │ What do you want to do about modified configuration file              │
   │ 50unattended-upgrades?                                                │
   │                                                                       │
   │          install the package maintainer's version                     │
   │          keep the local version currently installed                   │
   │          show the differences between the versions                    │
   │          show a side-by-side difference between the versions          │
   │          start a new shell to examine the situation