Do you need to reboot after Linux update?
You do not have to restart your computer every time you update. Certain updates (such as those that affect your operating system kernel) will require rebooting to take effect. When such an update occurs, your session icon in the upper-right will glow red. You only need to restart when the update manager tells you to.
Why do we need to update kernel?
Like any other software, Linux Kernel also needs an update periodically. Every update typically includes fixes to security loopholes, bug fixes to problems, better hardware compatibility, improved stability, more speed, and occasionally major updates also bring some new functions and features.
Why is my Ubuntu kernel not booting?
Root device is the partition where GRUB expects to find the /boot directory with the kernel inside. If the root device points to a wrong partition, you won’t be able to boot. There was no need to do this before the update. If you’ve not manually tampered with GRUB, there is no reason to tamper with this setting.
What to do if your system is no longer bootable after a kernel upgrade?
Following a kernel upgrade, your system is no longer bootable. Rule 1: Don’t Panic! For less experienced users, understanding what went wrong can be difficult. I will try to help you reason out this problem, so that you have a clear methodology for handling similar issues in the future.
Why is initramfs not able to boot after kernel upgrade?
The actual problem is the ALERT! message. initramfs cannot find the device where it expects to find the actual kernel and therefore it cannot proceed with the boot sequence. The question is, why it cannot find the kernel? This is where we refer to the first part of the message, the common problems section.
What happens to the initrd.img file after a kernel upgrade?
Whenever your kernel is upgraded, a new initrd.img file is built, containing the latest drivers for your kernel. You can check this by yourself. Open the /boot directory and see that you may have several instances of initrd.img files there, one for each kernel version that was installed.