grub repair

sudo chroot "/mnt/boot-sav/sda2" dpkg --configure -a
sudo chroot "/mnt/boot-sav/sda2" apt-get install -fy
sudo chroot "/mnt/boot-sav/sda2" apt-get purge -y grub*-common grub-common:i386 shim-signed

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转载自www.cnblogs.com/jockeypan/p/8935571.html