install grub-customizer

 $ sudo apt install grub-customizer
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  hwinfo libhd21 libx86emu2
The following NEW packages will be installed:
  grub-customizer hwinfo libhd21 libx86emu2
0 upgraded, 4 newly installed, 0 to remove and 28 not upgraded.
Need to get 1.477 kB of archives.
After this operation, 7.005 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 libx86emu2 amd64 2.4-1 [45,5 kB]
Get:2 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 libhd21 amd64 21.68-1 [729 kB]
Get:3 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 hwinfo amd64 21.68-1 [18,0 kB]
Get:4 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 grub-customizer amd64 5.1.0-2 [684 kB]
Fetched 1.477 kB in 3s (574 kB/s)        
Selecting previously unselected package libx86emu2:amd64.
(Reading database ... 326117 files and directories currently installed.)
Preparing to unpack .../libx86emu2_2.4-1_amd64.deb ...
Unpacking libx86emu2:amd64 (2.4-1) ...
Selecting previously unselected package libhd21:amd64.
Preparing to unpack .../libhd21_21.68-1_amd64.deb ...
Unpacking libhd21:amd64 (21.68-1) ...
Selecting previously unselected package hwinfo.
Preparing to unpack .../hwinfo_21.68-1_amd64.deb ...
Unpacking hwinfo (21.68-1) ...
Selecting previously unselected package grub-customizer.
Preparing to unpack .../grub-customizer_5.1.0-2_amd64.deb ...
Unpacking grub-customizer (5.1.0-2) ...
Setting up libx86emu2:amd64 (2.4-1) ...
Setting up libhd21:amd64 (21.68-1) ...
Setting up hwinfo (21.68-1) ...
Setting up grub-customizer (5.1.0-2) ...
Processing triggers for bamfdaemon (0.5.3+18.04.20180207.2-0ubuntu2) ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for desktop-file-utils (0.24-1ubuntu3) ...
Processing triggers for mime-support (3.64ubuntu1) ...
Processing triggers for hicolor-icon-theme (0.17-2) ...
Processing triggers for gnome-menus (3.36.0-1ubuntu1) ...
Processing triggers for libc-bin (2.31-0ubuntu9.9) ...
Processing triggers for man-db (2.9.1-1) ...