I am trying to upgrade Raspbian Jessie 2016-02-26. Every time I try, the Pi hangs at
unpacking perl (5.20.2-3+deb8u4) over (5.20.2-3+deb8u3)
I have a 32 GB SD Card and have expanded the partition. Several re-attempts fail at the same place, each time. The Pi hangs with no response to the mouse or anything. Even the clock has frozen.