Ubuntu Server不再启动

I have an ubuntu server, that runs since a few month, and today, it tells me that i could run a command to update ubuntu. I did. And since, my server refuse to boot anymore. Here is the screen i have : enter image description here I can't scroll upper. Sometimes when i reboot i got the grub menu, and i can select Ubuntu or advanced options for ubuntu. Here is what i got in the advanced options : enter image description here It seems i got 2 versions on my harddrive (probably the pre update and post update). Anyone got an idea ? I'm out of idea right now ... Thank you

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