> Source: [sk183482](https://support.checkpoint.com/results/sk/sk183482)

# sk183482 - Security Gateway fails to boot into Gaia Operating System and enters GRUB 2 Rescue Mode

| Property | Value |
|----------|-------|
| Solution ID | sk183482 |
| Date Created | 2025-05-19 |
| Last Modified | 2026-07-03 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R82.10, R82, R81.20 |
| OS | Gaia |

## Symptoms

- * The Security Gateway does not boot into the Gaia operating system. Instead, it enters the GRUB Rescue mode (GRUB 2).

* In some cases, after a reboot, the system fails to load the Linux kernel and returns to the boot menu.

  The following output appears on the screen:

  ```
  error: file `/vmlinuz' not found.
  error: you need to load the kernel first.
  
  Press any key to continue...
  
  Failed to boot both default and fallback entries.
  
  Press any key to continue...
  
  Revert to Snapshot
  Start in no-debug mode
  Start in maintenance mode
  Start in online-debug mode
  Start in normal mode
  Start in hwdiag mode
  Revert to - <Factory Default - R82>
  ```

* This issue occurs on systems running Gaia version R81.20 or later, which use the GRUB 2 bootloader. For more information, see [sk92435 - How to verify in which boot mode the Security Gateway has rebooted](https://support.checkpoint.com/results/sk/sk92435).

## Cause

The Grub 2 configuration file is missing the `### BEGIN /etc/grub.d/10_linux ###` section, which contains the essential boot argument `/boot/grub2/grub.cfg`.

Example of missing argument:

` }`  
` menuentry 'Start in normal mode' --class gnu-linux --class gaia --class os --unrestricted --id gaia-normal --unrestricted {`  
` load_video`  
` set gfxpayload=keep`  
` insmod gzio`  
` insmod part_gpt`  
` insmod ext2`  
` set root='hd0,gpt2'`  
` if [ x$feature_platform_search_hint = xy ]; then`  
` search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 --hint='hd0,gpt2' 9769a106-0139-4db3-8a97-199660fcca64`  
` else`  
` search --no-floppy --fs-uuid --set=root 9769a106-0139-4db3-8a97-199660fcca64`  
` fi`  
` linux16 /vmlinuz ro panic=15 spectre_v2=off intel_idle.max_cstate=0 eagerfpu=on nopti vmalloc=256M console=SERIAL grub_mode=64bit-normal root=/dev/vg_splat/lv_current rd.lvm.lv=vg_splat/lv_current crashkernel=0M-35G:280M,35G-250G:768M,250G-:1G 3 quiet`  
` initrd16 /initrd`  
` }`

## Solution

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---

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