please, be careful with SD card adapters. some USB flash drives can not be mount on reboot. I do not see any other reasons.I just tried twice to do the migration, which I thought I had done months ago...still not successfully though. The software downloads and says it installs then the LS reboots but Linux has not been installed. It apparently creates everything it needs to on the USB stick but the installation apparently never happens. Suggestions?
the plan B is to use factory SD and then import data from the usb that you had created while migration before.