This document will explain how to boot into the compatible kernel that was downloaded and installed into the COBOTTA. If the How to Change the Kernel document has now been completed, go back to the document to obtain a compatible kernel.


The following link contains the source of how to boot into the GRUB at the startup of the COBOTTA (the section of the link being used at the time of documenting contains 30 likes): How to get to the GRUB menu at boot-time 


The following link contains the source of how to change the kernel through the GRUB (the section of the link being used at the time of documenting contains 9 likes): How can I boot with an older kernel version 



Step 1:

Open a new terminal and enter the following to get into the GRUB text file to make the changes: 
$ sudo nano /etc/default/grub



Step 2:
Make the following changes to the GRUB text file:

Change:
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0

to:

GRUB_TIMEOUT_STYLE=false
GRUB_TIMEOUT=




Step 3:

Save the changes in the text file by pressing 'CTRL + O + Enter' and exit by pressing 'CTRL + X' .





Step 4:

Enter the following into the terminal to update the GRUB and to reboot the COBOTTA to have the GRUB boot at startup:


$ sudo update-grub
$ sudo reboot



Step 5:

When the GRUB appears, immediately use the up and down arrow keys to maneuver and highlight over the Advanced options for Ubuntu. Then hit the right arrow key once the section has been highlighted to be taken to the list of installed kernels.
Step 6:

Once the list of installed kernels, identify the number order to know the number of the compatible kernel. The top kernel (first kernel) is kernel number 0.Count down from top to bottom to identify the compatible kernel.


Step 7:

Once the number of the compatible kernel has been identified, enter any of the kernels that DO NOT have recovery mode labeled next to it.





Step 8:

Once Ubuntu has finished loading in, login into Ubuntu and then open a new terminal.



Step 9:

Enter the following into the terminal to make changes into the GRUB text file for it stop booting in at startup and to boot into the compatible kernel:
$ sudo nano /etc/default/grub



Step 10:

Make the following changes to the GRUB text file:
Change:
GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=false
GRUB_TIMEOUT=

to:

GRUB_DEFAULT="1>#"
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0



Note: 
The "#" in the code stands for the identified, compatible kernel number found in step 6



Step 11:

Save the changes in the text file by pressing 'CTRL + O + Enter' and exit by pressing 'CTRL + X' .






Step 12:

Enter the following into the terminal to update the GRUB and to reboot the COBOTTA to use the compatible kernel:



$ sudo update-grub
$ sudo reboot



Step 13:

Once Ubuntu is loaded into the login screen, login and open a new terminal and enter the following to see if the kernel has changed to the compatible kernel:
$ uname -r
$ uname -a



Note: 
If the kernel has not changed, repeat the process. If the Ubuntu screen appears enlarged or zoomed in, proceed to the Fixing an Enlarged/Zoomed in Ubuntu Screen document to troubleshoot the issue.




This concludes the How to Boot into the COBOTTA with a Compatible Kernel document. Proceed onto the Installing the COBOTTA Driver document.



Finished