pstree shows that it hangs here
 ├─bash───apt-get───dpkg───frontend───kexec-tools.pos───update-grub

Attaching to update-grub:
$ sudo strace -p 8542
Process 8542 attached - interrupt to quit
read(0, 

Well, it seams to wait for something from stdin, nothing comes. 
Accoding to /proc/8542/fd/0 that descriptor is a (broken) pipe.

-- 
package kexec-tools 1:2.0.1-1ubuntu1 failed to install/upgrade: subprocess 
installed post-installation script killed by signal (Interrupt)
https://bugs.launchpad.net/bugs/518853
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