Redmi note 9 cant fastboot i need help

I want to put in my phone ubuntu touch …when i press powee but and vol down my phone screens open and boot normal no to fastboot mode some help please

You need to follow these steps:

  • boot normally,
  • Settings>Advanced>Dirity
  • Enable debugging

Now connect your phone to adb

  • download desired system (with curl or in browser)
  • install it on your device using adb install <imageName>
  • restart phone (via adb restart)
  • unplug your phone from pc