The latest kernel is causing problems with my sound, which worked fine with an older version. As I have only Ubuntu installed, Grub is not getting displayed while booting. How can I manually choose my kernel version while booting?
The simplest way to display your Grub is to press and hold the SHIFT button while booting.
As an alternative, you can always display Grub without it booting any particular kernel:
gksudo gedit /etc/default/grub
GRUB_TIMEOUT to -1 and comment out
finish off by running
While booting when GRUB appears with entries select the second entry i.e., Advanced options for Ubuntu there you can see different older kernel versions which was installed previously, you can select one among them which works good for you. Otherwise you go to the grub.cfg and paste your required kernel version on top of currently installed kernel entry. In both ways it works
This setting determines how long a screen without the GRUB 2 menu will be displayed. While the screen is blank, the user can press any key to display the menu.
The default behavior is to hide the menu if only one operating system is present. If a user with only Ubuntu wishes to display the menu, place a # symbol at the start of this line to disable the hidden menu feature.
Downgrade Kernel: How to downgrade the Kernel on 11.10
Upgrade kernel: How can I upgrade kernel to 3.1?
I found it simplest to do this using grub-customizer: http://ubuntuhandbook.org/index.php/2014/04/install-grub-customizer-ubuntu-1404/