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I installed linux-image-3.12.24-031224-generic on Ubuntu 12.04 but cannot find a way to start it. uname -r still says 3.2.0-80-generic.

 $ dpkg -l | grep linux-image
ii  linux-image-3.12.24-031224-generic     3.12.24-031224.201407041335                         Linux kernel image for version 3.12.24 on 64 bit x86 SMP
ii  linux-image-3.2.0-23-generic           3.2.0-23.36                                         Linux kernel image for version 3.2.0 on 64 bit x86 SMP
ii  linux-image-3.2.0-80-generic           3.2.0-80.116                                        Linux kernel image for version 3.2.0 on 64 bit x86 SMP
ii  linux-image-generic                    3.2.0.80.94                                         Generic Linux kernel image

When I select advanced options for 12.04 in GRUB during startup, it only lists the 3.2 kernels.

Am I missing a step?

@EricClemons ls /boot before and after sudo update-grub:

$ ls /boot
abi-3.12.24-031224-generic         initrd.img-3.2.0-80-generic
abi-3.2.0-23-generic               memtest86+.bin
abi-3.2.0-80-generic               memtest86+_multiboot.bin
config-3.12.24-031224-generic      System.map-3.12.24-031224-generic
config-3.2.0-23-generic            System.map-3.2.0-23-generic
config-3.2.0-80-generic            System.map-3.2.0-80-generic
grub                               vmlinuz-3.12.24-031224-generic
initrd.img-3.12.24-031224-generic  vmlinuz-3.2.0-23-generic
initrd.img-3.2.0-23-generic        vmlinuz-3.2.0-80-generic

3.12.24 still does not show up though.

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Do you see your new image in the /boot directory?

$ ls /boot

It may be as simple as doing:

$ sudo update-grub
  • Thanks Eric, I modified my question, no enough space here. – LV3 Apr 20 '15 at 11:53

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