[Bug 1918086] Re: Ubuntu 18.04 reboot failed and shows "you need to load the kernel first"

[Steve Langasek]

This error message shows that grub is not able to read the file
/boot/vmlinuz-5.4.0-58-generic from your filesystem. Either the file is
not there, or your filesystem is corrupted so that the file can not be
read. In either case, this does not appear to be a bug in grub.  Please
try rebooting to the boot menu and choosing the fallback kernel to see
if this works.

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https://bugs.launchpad.net/bugs/1918086

Title:
  Ubuntu 18.04 reboot failed and shows "you need to load the kernel
  first"

Status in grub package in Ubuntu:
  New

Bug description:
  when I reboot uBuntu,it shows

  载入 linux 5.4.0-58-generic ...
  错误：Can't read kernel /boot/vmlinuz-5.4.0-58-generic
  载入初始化内存盘...
  错误：you need to load the kernel first

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