boot stops after displaying "Loading initial ramdisk..."

[robert]

Hi there

while working on my Dell xps 15 laptop with Ubuntu 19.10 beta Firefox started to 
behave strangely.

So I rebooted my laptop. Since then it fails to boot.

I tried to run it from a 19.04 live cd, and then to upgrade/update as described in:

https://help.ubuntu.com/community/LiveCdRecovery#Update_Failure


    Update Failure

If there was an update that made your system non-bootable and they have fixed it 
in the repositories, you can use the Live CD to run apt-get to get the new files 
to fix your system.

 1. Boot the Ubuntu Live CD.
 2.

    PressCtrl-Alt-F1

 3.

    sudo mount /dev/sda1 /mnt

 4.

    sudo mount --bind /dev /mnt/dev

 5.

    sudo mount --bind /proc /mnt/proc

 6.

    sudo mount --bind /sys /mnt/sys

 7.

    sudo chroot /mnt

 8.

    apt update

 9.

    apt upgrade

this did not help.

Can anybody please give me a hint how to fix this..

thanks

robert

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