I'm a newbie in ubuntu.

I want to get help because I'm facing a kernel panic problem like below.

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So I googled and found some solutions and tried.

Solution1. Tried another version of kernel and its recovery mode.

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I tried all of them. And they showed same kernel panic and exitcode=0x00000100.

Solution2. Made Ubuntu 18.04 LTS Live USB and tried to boot with USB.

But my computer displayed nothing then.

Solution3. Tried to boot manually in grub2 command line following this link.
https://www.linux.com/training-tutorials/how-rescue-non-booting-grub-2-linux/

But in grub, I couldn't found any sda or other device in /dev directory
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Thanks for reading and apologize for my poor English.