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

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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

** Affects: grub (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment kernel-bug ubuntu
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Ubuntu 18.04 reboot failed and shows "you need to load the kernel first"
https://bugs.launchpad.net/bugs/1918086
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