How to show GRUB menu instead of command line?

I try to install Ubuntu 18.04 on a Lenovo Ideapad 320 , but the installer always hangs at installing the

package. So I ran the installer with

-b

(no bootloader) and it installs fine. I thought this way I could install grub manually. When I boot, grub drops to the

>

command line prompt. I can boot using the following commands:

set root=hd0,msdos5
linux /vmlinuz root=/dev/sda5
initrd /initrd.img
boot

I tried getting a normal grub menu in many ways, but none seem to work. I ran

-install /dev/sda

,

-update

, I tried modifying the

/etc/default/grub

configuration file, etc. But I keep getting the

>

prompt. How do I get the menu? Edit: This is what

/etc/default/grub

looks like:

GRUB_DEFAULT=0
#GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=lsb_release -i -s 2> /dev/null || echo Debian
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""