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I checked the link Failed to get canonical path of /cow, but I'm still experiencing an error. I tried to install Ubuntu via usb on the pc and encountered a failed-to-get-canonical-path-of-cow error. I followed the link and when I enter the update-grub2 command, error: cannot find a device for / (is/dev mounted?) appears. Please help me

As a result, I want to move the current booting to the hard disk, which command should I enter?

I don't know where it went wrong.

cocon
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    You are running commands on live installer, not your install. /cow is copy on write or live installer which is not wrieable. Please copy & paste the pastebin link to the Bootinfo summary report ( do not post report), do not run the auto fix till reviewed.Lets see details, use ppa version with your USB installer (2nd option) or any working install, not Boot-Repair ISO https://help.ubuntu.com/community/Boot-Repair
    https://sourceforge.net/p/boot-repair/home/Home/ What brand/model system?     – oldfred Feb 24 '22 at 13:46
  • @oldfred Why is it named "cow"?! At first glance, that doesn't seem to tell me anything meaningful about the directory. What is the /cow directory for? – cocomac Feb 25 '22 at 01:29
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    /cow is Copy On Write. Or the live installer which you cannot update. – oldfred Feb 25 '22 at 03:31

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