I am using elementary OS Hera( it's based on ubuntu 18).When I start my PC today,I was block to a black screen with a prompt blinking that never end.Usually the prompt blink a few seconds and the welcome screen appears but this time it doesn't.I reboot many time but I get the same problem.I tried to boot with the recovery mode and I notice that it works.After that I tried again to boot with the normal mode but it stucks again with the same error.In brief,I can boot correctly with the recovery mode,but there is a black screen with a endless blinking prompt when I boot with the normal mode.Thank you in advance for your help.

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