Disable Grub2 theme in Ubuntu MATE

Gurb 2 has GUI theme.

It may lag the boot time. User can remove it to get back legacy Grub theme.
Apply following command to remove Grub 2 theme.

sudo apt-get remove grub2-themes-ubuntu-mate

Then update Grub

update-grub

GRUB 2 recovery

We often come across a condition in which the boot loader gets corrupt. Here are a few steps that will help you recover your GRUB 2 boot loader.
Boot from a live CD or DVD, which supports GRUB 2 (Ubuntu 9.10 CD or above. A DVD will take more time than a CD, so I suggest you boot from a CD).
Open the terminal and run fdisk -l to check the partition from which you want to recover GRUB 2.
Here I assume that you want to recover it from /dev/sda1.
Then run the following commands:
 
sudo mkdir /media/sda1
sudo mount /dev/sda1 /media/sda1
sudo mount --bind /dev /media/sda1/dev
sudo mount --bind /proc /media/sda1/proc
Now chroot into that partition by running the command given below:

sudo chroot /media/sda1

Then re-install GRUB, as follows:

grub-install /dev/sda

The output should be like what’s shown below:

Installation finished. No error reported.

If you get an error, then try the following command:

grub-install --recheck /dev/sda

After a successful installation, exit from chroot and unmount the file systems that were mounted to recover GRUB. Now reboot.

exit
sudo umount /media/sda1/proc
sudo umount /media/sda1/dev
sudo umount /media/sda1
sudo reboot

You’ve successfully completed recovering your GRUB boot loader.

Information courtesy: EFYTimes News

Change grahical Ubuntu boot splash into text mode

gedit /etc/default/grub

Find the word "quiet splash".
Remove the word "quiet splash".

Save the file.

Update the grub.

update-grub

How to change boot splash in to text mode

You can change Ubuntu traditional graphical boot splash into text mode. See the following commands,

gedit /etc/default/grub

Find the following line,

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

Delete the words "quiet splash" . See the modified line below,

GRUB_CMDLINE_LINUX_DEFAULT=""

Then update the Grub,

sudo update-grub

How to update Grub ?

In certain cases while Linux installation, other operating system (e.g. Windows) not detected and listed in star up.  In such cases you can update grub from Linux. Open a terminal and execute the following commands,

sudo su
update-grub

Restart your system

Startupmanager

Very useful tool controlling your Ubuntu startup behavior.

Installation

apt-get install startupmanager

You can launch Startupmanager from Administration Menu.