Comment 3 for bug 1319213

a) due to bug 1235436 we never see files being uploaded at all on the normal images
b) ubuntu-device-flash always cleans up the whole system when doing a fresh install , not cleaning up is definitely dualboot specific here
c) a normal OTS upgrade should definitely clean these files and for this i agree it should happen in both installation setups via the system-image-upgrader script from recovery ... opening an android task for that bit