env: debian unstable/ kernel 2.6.31/ dpkg 1.15.5.3 (i386)/ apt 0.7.24 for i386 compiled on Sep 25 2009 20:05:59 I try to exec `aptitude upgarde` ,but it hangs at the step Setting up grub-pc (2009xxx) ... even if I try to run sudp dkpg --configure -a it hangs at that step as well. However, there is no problem if I run `apt-get upgrade` Everything works fine. What may cause this problem? Or is there any log I can check so that I can report bug (if it is)? Many thanks,