I remove 10_linux_proxy this file.
But below command can not help to create this file.
sudo apt-get install --reinstall grub-common
sudo update-grub.

Then I can only use  boot-repair software to reinstall GRUB.
Now it is OK.
No error message anymore.

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https://bugs.launchpad.net/bugs/998835

Title:
  error: unknown command "gfxmode"

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