How to get rid of purple background color in newt apps?

Question

For some reason newt apps (whiptail, partimage, debconf ...) have all decided to use purple background. How to get regular blue background back ?

$ whiptail --title 'WARNING'  --yesno "Completely unsafe, proceed anyway ?" 8 50

At first i thought this might be some weird term issue but ncurses apps are faithful to their blue background:

$ dialog --yesno "Completely unsafe, proceed anyway ?"  5 40

Answer 1

Took a while to figure out, turns out symlink for newt apps color palette has been changed:

http://cosmicb.no/2011/10/05/getting-rid-of-ubuntu-violet-colors/

$ ls -l /etc/alternatives/newt-palette
lrwxrwxrwx 1 root root 26 Dec 28  2014 /etc/alternatives/newt-palette -> /etc/newt/palette.ubuntu

To put it back :

$ sudo ln -sf /etc/newt/palette.original  /etc/alternatives/newt-palette