I installed Linux Ubuntu 20.04 directly from Windows 10. It rebooted and I could boot from the USB flash disk to perform the installation.
After installing everything correctly, I realized that, after rebooting the OS, GRUB is not showing to me and boots directly on Ubuntu. I run grub-repair, and I am showing a shot from the sw below.
from the picture above, it seems that my OS is installed in UEFI mode. When I run boot repair and I reboot the same problem happens. No Grub showing, it boots directly to Ubuntu.
One thing I realized is that my machine (a brand new PC) does not show anything in the boot (was the fast boot activated on my Windows OS/BIOS?), and boots directly on Ubuntu. I tried to enter BIOS by pressing ESC, DELETE, F1, F2, F10, F11 and F12. Nothing.
Below are the contents of the /etc/default/grub file
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'
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=""
Uncomment to enable BadRAM filtering, modify to suit your needs
This works with Linux (no patch required) and with any kernel that obtains
the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console
The resolution used on graphical terminal
note that you can use only modes which your graphic card supports via VBE
you can see them in real GRUB with the command `vbeinfo'
GRUB_GFXMODE=640x480
Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true
Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"
Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
Here are the contents of /boot/efi
Here are the contents of /boot/grub/grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#
BEGIN /etc/grub.d/00_header
if [ -s $prefix/grubenv ]; then
set have_grubenv=true
load_env
fi
if [ "${initrdfail}" = 2 ]; then
set initrdfail=
elif [ "${initrdfail}" = 1 ]; then
set next_entry="${prev_entry}"
set prev_entry=
save_env prev_entry
if [ "${next_entry}" ]; then
set initrdfail=2
fi
fi
if [ "${next_entry}" ] ; then
set default="${next_entry}"
set next_entry=
save_env next_entry
set boot_once=true
else
set default="menuentry 'Windows Boot Manager (on /dev/nvme0n1p1)' --class windows --class os 'osprober-efi-36CE-B279' {"
fi
if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
else
menuentry_id_option=""
fi
export menuentry_id_option
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi
function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}
function initrdfail {
if [ -n "${have_grubenv}" ]; then if [ -n "${partuuid}" ]; then
if [ -z "${initrdfail}" ]; then
set initrdfail=1
if [ -n "${boot_once}" ]; then
set prev_entry="${default}"
save_env prev_entry
fi
fi
save_env initrdfail
fi; fi
}
function recordfail {
set recordfail=1
if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}
function load_video {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
else
insmod efi_gop
insmod efi_uga
insmod ieee1275_fb
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
fi
}
if [ x$feature_default_font_path = xy ] ; then
font=unicode
else
insmod part_msdos
insmod ext2
set root='hd1,msdos5'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos5 --hint-efi=hd1,msdos5 --hint-baremetal=ahci1,msdos5 3d41e78e-87bd-4edf-801d-249386bf9857
else
search --no-floppy --fs-uuid --set=root 3d41e78e-87bd-4edf-801d-249386bf9857
fi
font="/usr/share/grub/unicode.pf2"
fi
if loadfont $font ; then
set gfxmode=640x480
load_video
insmod gfxterm
set locale_dir=$prefix/locale
set lang=en_US
insmod gettext
fi
terminal_output gfxterm
if [ "${recordfail}" = 1 ] ; then
set timeout=10
else
if [ x$feature_timeout_style = xy ] ; then
set timeout_style=hidden
set timeout=10
Fallback hidden-timeout code in case the timeout_style feature is
unavailable.
elif sleep --interruptible 10 ; then
set timeout=10
fi
fi
END /etc/grub.d/00_header
BEGIN /etc/grub.d/05_debian_theme
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
END /etc/grub.d/05_debian_theme
BEGIN /etc/grub.d/10_linux
function gfxmode {
set gfxpayload="${1}"
if [ "${1}" = "keep" ]; then
set vt_handoff=vt.handoff=7
else
set vt_handoff=
fi
}
if [ "${recordfail}" != 1 ]; then
if [ -e ${prefix}/gfxblacklist.txt ]; then
if hwmatch ${prefix}/gfxblacklist.txt 3; then
if [ ${match} = 0 ]; then
set linux_gfx_mode=keep
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=keep
fi
else
set linux_gfx_mode=text
fi
export linux_gfx_mode
menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-3d41e78e-87bd-4edf-801d-249386bf9857' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_msdos
insmod ext2
set root='hd1,msdos5'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos5 --hint-efi=hd1,msdos5 --hint-baremetal=ahci1,msdos5 3d41e78e-87bd-4edf-801d-249386bf9857
else
search --no-floppy --fs-uuid --set=root 3d41e78e-87bd-4edf-801d-249386bf9857
fi
linux /boot/vmlinuz-5.4.0-42-generic root=UUID=3d41e78e-87bd-4edf-801d-249386bf9857 ro quiet splash $vt_handoff
initrd /boot/initrd.img-5.4.0-42-generic
}
submenu 'Advanced options for Ubuntu' $menuentry_id_option 'gnulinux-advanced-3d41e78e-87bd-4edf-801d-249386bf9857' {
menuentry 'Ubuntu, with Linux 5.4.0-42-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.4.0-42-generic-advanced-3d41e78e-87bd-4edf-801d-249386bf9857' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_msdos
insmod ext2
set root='hd1,msdos5'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos5 --hint-efi=hd1,msdos5 --hint-baremetal=ahci1,msdos5 3d41e78e-87bd-4edf-801d-249386bf9857
else
search --no-floppy --fs-uuid --set=root 3d41e78e-87bd-4edf-801d-249386bf9857
fi
echo 'Loading Linux 5.4.0-42-generic ...'
linux /boot/vmlinuz-5.4.0-42-generic root=UUID=3d41e78e-87bd-4edf-801d-249386bf9857 ro quiet splash $vt_handoff
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-5.4.0-42-generic
}
menuentry 'Ubuntu, with Linux 5.4.0-42-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.4.0-42-generic-recovery-3d41e78e-87bd-4edf-801d-249386bf9857' {
recordfail
load_video
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_msdos
insmod ext2
set root='hd1,msdos5'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd1,msdos5 --hint-efi=hd1,msdos5 --hint-baremetal=ahci1,msdos5 3d41e78e-87bd-4edf-801d-249386bf9857
else
search --no-floppy --fs-uuid --set=root 3d41e78e-87bd-4edf-801d-249386bf9857
fi
echo 'Loading Linux 5.4.0-42-generic ...'
linux /boot/vmlinuz-5.4.0-42-generic root=UUID=3d41e78e-87bd-4edf-801d-249386bf9857 ro recovery nomodeset
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-5.4.0-42-generic
}
}
END /etc/grub.d/10_linux
BEGIN /etc/grub.d/10_linux_zfs
END /etc/grub.d/10_linux_zfs
BEGIN /etc/grub.d/20_linux_xen
END /etc/grub.d/20_linux_xen
BEGIN /etc/grub.d/30_os-prober
menuentry 'Windows Boot Manager (on /dev/nvme0n1p1)' --class windows --class os $menuentry_id_option 'osprober-efi-36CE-B279' {
insmod part_gpt
insmod fat
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root 36CE-B279
else
search --no-floppy --fs-uuid --set=root 36CE-B279
fi
chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}
set timeout_style=menu
if [ "${timeout}" = 0 ]; then
set timeout=10
fi
END /etc/grub.d/30_os-prober
BEGIN /etc/grub.d/30_uefi-firmware
menuentry 'UEFI Firmware Settings' $menuentry_id_option 'uefi-firmware' {
fwsetup
}
END /etc/grub.d/30_uefi-firmware
BEGIN /etc/grub.d/40_custom
This file provides an easy way to add custom menu entries. Simply type the
menu entries you want to add after this comment. Be careful not to change
the 'exec tail' line above.
END /etc/grub.d/40_custom
BEGIN /etc/grub.d/41_custom
if [ -f ${config_directory}/custom.cfg ]; then
source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
END /etc/grub.d/41_custom
How can I see GRUB when I boot?
