is there an alternative to usbkill or silk-guardian in Debian? I saw usbkill and silk-guardian sometime back. I specifically like the whole shutdown or whatever I want to be done if a usb key is inserted which isn't whitelisted before. Does anybody of any alternative software which has the same/similar functionality in Debian.

There's usbguard:

> USB device authorization policy framework
>
> The USBGuard software framework helps to protect your computer against rogue USB devices (a.k.a. BadUSB) by implementing basic whitelisting and blacklisting capabilities based on device attributes.

There's also a GUI available with usbguard-applet-qt:

> This package contains the qt-applet for controlling usbguard.

All this won't protect the computer from an USB Kill key, unless an electrical safety device is used between.