I have installed Debian9 on EMMC (after formatting the whole drive). It was working fine for few days until yesterday. It wont let me sign in after booting up even though the user name and password are 100% correct. Anyhow, so I decided to install ubuntu . I reached the UEFI screen successfully however it won't let me select any of the options except continue. if I select any of the other options it will just freeze until I hit ESC again . And if select continue I will end up having Debian login terminal again and won't let me to log in . I have the following: - Removing wifi kit - Removing RTC battery for an hour basically only the bootable usb(even tried without) and keyboard are connected. Please Advise.