This articles is to help users resolve simple problem regarding kernel update. The most common problem is after a kernel update is when the system fails to boot. Occasionally, problems occurs with the kernel updates, you need to boot to previous kernel until further system update provides patches to the system.
Booting to Previous Kernel
- When the system startup, press <Tab> few times to make sure the boot menu shows. If it doesn’t work, try a few times.
- The <Tab> key must hit the system when the system boots up.
- IF you manage to get the boot menu, move the arrow key and select the previous kernel release.
Configure Boot Menu to use Previous Kernel
- Once you are into the system, you need to configure the boot menu such that it boots to the previous kernel.
- Use your favorite editor and open the file /boot/grub/grub.conf using root access.
- In the menu, change the default to 1.
Configure Boot Menu to show Boot Menu
- To avoid hitting <tab> key many time to display the boot menu, you might want to change some entries in the grub.conf file.
- Open the file /boot/grub/grub.conf.
- Under the entry timeout=0, change it to timeout=2. This allows the boot menu to show for 2 seconds.
- Hash out the #hiddenmenu. This will show the boot menu.
- Every time when you start the machine, the boot menu will display for 2 seconds.
Drivers Failed after Kernel Update
- Unfortunately, some driver which you’ve installed manually usually failed after kernel update. There is nothing much you can do except to reinstall all the proprietary drivers after kernel update.
- The most common driver issue are video drivers and sound drivers.
- If you’ve install proprietary Nvidia drivers to run Compiz. You need to reinstall the drivers every time when there is a new update on the kernel.
- If you do not have a sound driver for your sound card and resort to use ALSA generic sound driver. You need to reinstall the drivers.