TIPS : Tombol Keyboard Tertentu Tidak Bisa Muncul

alooo@alooo-baru:~$ sudo update-grub
[sudo] password for alooo:
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-4.15.0-76-generic
Found initrd image: /boot/initrd.img-4.15.0-76-generic
Found linux image: /boot/vmlinuz-4.15.0-74-generic
Found initrd image: /boot/initrd.img-4.15.0-74-generic
Found linux image: /boot/vmlinuz-4.15.0-72-generic
Found initrd image: /boot/initrd.img-4.15.0-72-generic
Found linux image: /boot/vmlinuz-4.15.0-70-generic
Found initrd image: /boot/initrd.img-4.15.0-70-generic
Found linux image: /boot/vmlinuz-4.10.0-28-generic
Found initrd image: /boot/initrd.img-4.10.0-28-generic
Found linux image: /boot/vmlinuz-4.4.0-173-generic
Found initrd image: /boot/initrd.img-4.4.0-173-generic
Found linux image: /boot/vmlinuz-4.4.0-171-generic
Found initrd image: /boot/initrd.img-4.4.0-171-generic
Found linux image: /boot/vmlinuz-4.4.0-170-generic
Found initrd image: /boot/initrd.img-4.4.0-170-generic
Found linux image: /boot/vmlinuz-4.4.0-169-generic
Found initrd image: /boot/initrd.img-4.4.0-169-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done