May 22 2013
Kernel updates and grub settings in Ubuntu
Ubuntu tips for Linux kernel updates and grub settings:
I always try to install Ubuntu security or Linux kernel updates. But sometimes I get problems with graphics drivers and Linux kernels because my graphics driver is not compatible with latest Linux kernel. Then I have to boot with older Linux kernel version in Ubuntu. That’s why I wanted to write small tips.
- Which Linux kernel version I have?
Open a terminal with
Ctrl-Alt-T or from Unity menu
uname -sr press enter. (-s name of the operating system, -r the operating system release level)
- List of all installed Linux kernels in Terminal:
dpkg --list | grep linux-image
- How can I see Ubuntu boot menu on startup?
Display your Grub is to press and hold the SHIFT button while booting.
- Boot settings in grub: How can I boot with older Linux kernel?
Open grub in editor:
sudo gedit /etc/default/grub
#This is newest Linux kernel and default setting in Ubuntu
# Set default for older Linux kernel (first entry is 0 in grub boot menu)
# 2 for Previous Linux versions 4 for me Linux 3.2.0-38-generic
# see your previous Linux versions in grub menu
Save your changes and close editor. Then type:
Without update-grub command your changes will not be applied! Reboot and you can see your selected Linux kernel with
uname -sr command.
- What happens if my GRUB_DEFAULT setting is wrong?
Don’t worry! Ubuntu will boot with the latest kernel.
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