- Ensure you have a good power supply. This is the most important thing as flashing the BBB is pretty power intensive. The USB power supply featured in this guide is fully capable.
- Unplug the Ethernet while flashing. It can consume a bit of power unnecessarily.
- Try again. Sometimes it can take a couple of tries to get the process going. Also, make sure you've held the user boot button down the entire time until the LED's light up, prior to plugging in the power. Re-seat the SD card.
- Copy the image to your SD card again. It's possible that this process wasn't fully successful.
You can do this by executing the following command:
opkg update ; opkg install openssh-keygen
Another option is to execute the following command (configure it to execute on startup as well):
/usr/bin/ntpdate -b -s -u pool.ntp.org
opkg --tmp-dir ~ update opkg --tmp-dir ~ upgrade