attento a come imposti
root@ubuntu:/# cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
# / was on /dev/sda6 during installation
UUID=693eaa28-3516-4681-8564-afea96a90e0a / ext4 errors=remount-ro 0 1
# /boot/efi was on /dev/sda5 during installation
UUID=CF5C-92B4 /boot/efi vfat umask=0077 0 1
/swapfile none swap sw 0 0
root@ubuntu:/# mount /dev/sda5
mount: /: /dev/sda5 already mounted on /.
root@ubuntu:/# sudo apt-get install --reinstall grub
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package grub is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
grub2-common grub-pc grub2-common:i386 grub-pc:i386 grub-efi-ia32:i386
grub-efi-amd64:i386 grub-efi-ia32 grub-efi-amd64
inoltre devi avviare SENZA selezionare UEFI <dispositivo> ma solo <dispositivo> nel menu di selezione
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