1. open
sudo gedit /etc/default/grub
2. Find
#GRUB_GFXMODE=640x480
3. Replace the above line by the following line
GRUB_GFXMODE=1920x1080
4. update command
sudo update-grub
5. restart your system
sudo reboot
1. open
sudo gedit /etc/default/grub
2. Find
#GRUB_GFXMODE=640x480
3. Replace the above line by the following line
GRUB_GFXMODE=1920x1080
4. update command
sudo update-grub
5. restart your system
sudo reboot