[pkg-apparmor] Bug#884278: prevent deinstallation of boot-critical package

[Joachim Wuttke]

> How did you draw the conclusion that this system
> hang was caused by deinstalling the apparmor package?

After the Grub chooser, on default boot mode, I got
a black text screen, then one line, saying that /dev/sdb1
was clean, then nothing more happened.

In recovery mode, I got more than one screen full of
messages. The last line was vaguley security related,
but did not indicate any failure. A few lines above,
the was a Debian related line that contained "+APPARMOR",
among many other flags.

This recalled me that I had deinstalled apparmor. So
I mounted my root file system from a rescue disk,
installed apparmor, rebooted, and everything was
back to normal.


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