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sudo sed -i 's/GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"/GRUB_CMDLINE_LINUX_DEFAULT="nomodeset"/' 
/etc/default/grub  

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 sudo update-grub

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oland@roland-HP-Pavilion-dv6-Notebook-PC:~$ sudo sed -i 's/GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"/GRUB_CMDLINE_LINUX_DEFAULT="nomodeset"/' 
/etc/default/grub  
[sudo] Mot de passe de roland :             
sed: pas de fichier d'entrée
bash: /etc/default/grub: Permission non accordée
roland@roland-HP-Pavilion-dv6-Notebook-PC:~$ sudo update-grub
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/50_linuxmint.cfg'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-6.8.0-88-generic
Found initrd image: /boot/initrd.img-6.8.0-88-generic
Found linux image: /boot/vmlinuz-6.8.0-87-generic
Found initrd image: /boot/initrd.img-6.8.0-87-generic
Found linux image: /boot/vmlinuz-6.8.0-38-generic
Found initrd image: /boot/initrd.img-6.8.0-38-generic
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
Adding boot menu entry for UEFI Firmware Settings ...
done
roland@roland-HP-Pavilion-dv6-Notebook-PC:~$ 

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sudo sed -i 's/GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"/GRUB_CMDLINE_LINUX_DEFAULT="nomodeset"/' /etc/default/grub 

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cat /etc/default/grub

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roland@roland-HP-Pavilion-dv6-Notebook-PC:~$ cat /etc/default/grub
# 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=0
GRUB_DISTRIBUTOR=`( . /etc/os-release; echo ${NAME:-Ubuntu} ) 2>/dev/null || echo Ubuntu`
GRUB_CMDLINE_LINUX_DEFAULT="nomodeset"
GRUB_CMDLINE_LINUX=""

# If your computer has multiple operating systems installed, then you
# probably want to run os-prober. However, if your computer is a host
# for guest OSes installed via LVM or raw disk devices, running
# os-prober can cause damage to those guest OSes as it mounts
# filesystems to look for things.
#GRUB_DISABLE_OS_PROBER=false

# 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_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"
roland@roland-HP-Pavilion-dv6-Notebook-PC:~$ 

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sudo sed -i "s/#GRUB_GFXMODE=640x480/GRUB_GFXMODE=1280x720,auto/" /etc/default/grub

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sudo sed -i "s/GRUB_TIMEOUT_STYLE=hidden/GRUB_TIMEOUT_STYLE=menu/" /etc/default/grub

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sudo update-grub