Comment 28 for bug 134858

I still have got this problem using apt-get (sometimes, but not always). The sympthoms are: apt-get stops after an "Unpacking replacement XYZ ..." message, and the terminal does not react, I mean, I can't use CTRL+C, CTRL-Z or eg pressing any character/enter will not echo anything in the terminal as usuall (even running a CLI command). From another terminal window:

lgb@oxygene:~$ ps aux | egrep 'dpkg|apt'
root 15607 0.6 1.5 32716 16228 pts/1 S+ 16:06 0:02 apt-get upgrade
root 16091 1.5 0.0 0 0 ? Zs 16:06 0:06 [dpkg] <defunct>

Only killing apt-get helps from another terminal with kill command.