(Almost) the same thing happens if you create a new feisty installation
using (e.g.) debootstrap.
The reason for this problem appears to be that the postinst script
unconditionally runs
setupcon --force --save
at the end. This messes up the X display. Switching to text mode and
back into X cures the display anomaly, but ...
Why is that call there, anyway? It definitely doesn't belong into a
postinst!
--
console-setup messes up usplash and vice versa
https://launchpad.net/bugs/60483
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