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Asked: 2016-06-22 22:55:24 +0800 CST

Kernel update required 2 reboot. Why?

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I regularly update my Trusty 3.13 kernel on Updates Manager notifications. As I do I such case, I remove the n-2 kernel just before upgrading so that my system remains with 2 kernel releases once the upgrade is done.

On last upgrade from 3.13.0-87 to 3.13.0-88, Updates Manager asked for reboot as usual, but once logged back in with -88, Update Manager asked again to reboot. Please, why ?

kernel

1 Answers

  1. From How does Ubuntu keep track of the “System restart required” flag in motd? You can see which packages requested the reboot:

    $ cat /var/run/reboot-required.pkgs 
linux-image-2.6.32-28-generic
dbus
network-manager

    I try to remove old kernels before I do the reboot. The removal of a kernel re-runs grub and triggers the reboot.

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