How do I install a non-PAE kernel on PAE-enabled hardware for Ubuntu 12.04?

32-bit 12.04 currently comes with a PAE kernel but I need to get a non-PAE kernel.

• It's as simple as doing this on your existing 32-bit 12.04 installation:

  • sudo apt-get install linux-image-generic

• followed by a this to remove the PAE kernel (so the system boots from the non-PAE by default):

  • sudo apt-get remove linux-image-generic-pae
  • Alternatively, comment out the GRUB_HIDDEN lines in /etc/default/grub and run sudo update-grub to display the grub menu upon boot, from which you can select the kernel to use.

• If you want to install a non-PAE kernel as part of a new installation, start with Xubuntu or Lubuntu 12.04 32-bit, both of which come with the non-PAE kernel. Once running, you can run sudo apt-get install ubuntu-desktop to get the full Unity desktop experience.

• In general, the two common kernel suffixes for 12.04 are:

  1. -generic (non-PAE for 32-bit; standard for 64-bit)
  2. -generic-pae (PAE and default for 32-bit only)

I couldn't install non-pae kernel with this command (from previous answer):

sudo apt-get install linux-image-$(uname -r)-generic

But on output was a kernel version, in my case 3.2.0-27, so I modified the command:

sudo apt-get install linux-image-3.2.0-27-generic

And it worked!