first use "grub-install" to reinstall the bootloader.
Grub updated from 2.06 to 2.12 version.
After updating the system
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sudo slapt-get -u
sudo slapt-get --upgrade
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sudo slapt-get -i glibc glibc-i18n glibc-zoneinfo kernel-firmware
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sudo cp /etc/default/grub.new /etc/default/grub
Important: mount efivarfs if we use slackel 64 edition.
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sudo mount -t efivarfs efivarfs /sys/firmware/efi/efivars
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sudo grub-install --target=x86_64-efi --efi-directory=/boot/efi --boot-directory /boot --recheck
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sudo /usr/sbin/install-upgrade-kernel install generic
For slackel 64 running from external ssd disk or a USB stick (Slackel is installed to external ssd disk or USB stick)
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sudo grub-install --target=x86_64-efi --no-nvram --removable
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sudo /usr/sbin/install-upgrade-kernel-ext-usb install generic
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efibootmgr
BootCurrent: 0000
Timeout: 0 seconds
BootOrder: 0002,2001,2002,2003
Boot0000* EFI USB Device (SanDisk) UsbWwid(781,557d,0,0002262906242222345)/HD(1,GPT,ef4a3dab-37f3-44b9-99da-4edc1795d724,0x800,0x96000)RC
Then reboot