![]() Unlike NX above, the VT flag will always show up if your CPU supports it, but the BIOS may still be disabling its ability to function. If you have no interest in running virtual machines, this is safe to leave disabled. If your system supports hardware virtualization (INTEL-VT or AMD-V), it may need to be enabled in the BIOS before this feature will be available for use by Ubuntu. If you believe you are incorrectly getting the boot-time warning, please open a bug report against the cpu-checker package, or disable the check by removing the motd module: sudo rm /etc/update-motd.d/20-cpu-checker It is required that you use PAE if you want true NX support. In Ubuntu 9.10 and later, if you run 32bit kernels without PAE, you will still have the partial NX emulation. As a bonus, you get to address all your physical RAM if you do this too (since the "PAE" mode is the kernel mode that allows NX to work). If you're using 32bit, you can start using it if you install the -server or -generic-pae flavor of the 32bit kernel. On Ubuntu 10.04 and later, you can check if your hardware is expected to have NX available by running the command:Īs far as making use of the CPU feature once it's not disabled in the BIOS, it will automatically be used if you’re running a 64bit kernel. In Samsung Netbooks (namely N140) enter with F2 the Bios and go to "Advanced" and set "EDB (Execute Disable Bit)" to "enabled". Lenovo IdeaPads) so make sure to install the latest BIOS if the NX option is missing. Some BIOS manufacturers have released firmware updates for their BIOS to allow enabling NX (e.g. In an American Megatrends BIOS, look under "CPU Features" / "Execute Disable Bit": it should be set to "enabled". In a Dell laptop BIOS, look under "Security" / "CPU XD Support": it should be set to "enabled".
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