I had my Yun working just as I wanted yesterday.
When I tried to start it today the Linux side would not boot. I took out my microSD card and it booted without it - but not when I replaced the SD Card. When I say it will not boot, I mean that it does not get to the stage where the too-bright white USB led lights and it connects to my WiFi network.
The only reason I can think of for the problem is that I disconnected it from my PC yesterday while I had an SSH session open (via WiFi) - only realized when it was too late.
Might that be the cause of the problem?
Has anyone any suggestions about how to diagnose or fix the problem short of completely rebuilding the microSD card ?
I could not find anything with Google.