Before the panics. However, the panics must be being caused by my wireless driver and firmware, which I also had to install manually, because the panics were occurring when I had the ethernet connection disconnected. The wireless driver is rt3562sta from Ralink and the firmware is rt2860.bin.
I have just completed a dist-upgrade via the wired connection. It took a very long time, but it finally succeeded. At times, the speed went to zero for several minutes at a time.
So, it seems I should not try to use my wireless card with this system. It is a Ralink RT3062. I have to install the firmware and compile the driver for every distro, but this is the first time it has caused kernel panics.
Thank you,
Tim