apt-get upgrade crash

root@beaglebone:~# apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be upgraded:
  apt apt-utils beaglebone dbus dbus-x11 dpkg dpkg-dev gnupg gpgv
  libapt-inst1.5 libapt-pkg4.12 libavcodec-dev libavcodec53 libavformat-dev
  libavformat53 libavutil-dev libavutil51 libdbus-1-3 libdbus-1-dev
  libdpkg-perl libgnutls26 libnspr4 libpostproc52 libsmbclient libssl-dev
  libssl-doc libssl1.0.0 libswscale-dev libswscale2 libwbclient0
  linux-libc-dev openssl tzdata
33 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 24.7 MB of archives.
After this operation, 74.8 kB of additional disk space will be used.
Do you want to continue [Y/n]? Y
Get:1 http://debian.beagleboard.org/packages/ wheezy-bbb/main beaglebone all 0.20140620.1 [4632 B]
Get:2 http://security.debian.org/ wheezy/updates/main dpkg armhf 1.16.15 [2571 kB]
Get:3 http://ftp.us.debian.org/debian/ wheezy-updates/main tzdata all 2014e-0wheezy1 [458 kB]
12% [Working]