How to Recover a Linux System After Deleting /lib64/libc.so.6 Using Rescue Mode

Background

When using Linux, accidental deletions such as removing important libraries or RPM packages can render the system unusable. This article records the step‑by‑step process to recover from such mistakes.

Significance

Learning to restore a Linux system after critical files are deleted by using rescue mode helps maintain system stability and avoid complete reinstallation.

Case Details

We delete the essential library /lib64/libc.so.6, which disables most basic commands, including shutdown. After a power‑off and reboot, the system hangs, prompting the use of rescue mode.

Rescue Mode Procedure

1. Reboot and press Esc at the boot splash to enter the Boot Menu.

2. Select the third option “CD‑ROM Drive” to boot from a CD.

3. Choose the third option “Rescue Mode”.

4. Select English as the language.

5. Skip network interface detection by choosing “No”.

6. Continue to the shell prompt. Note that the root directory in rescue mode is /mnt/sysimage; to work in the original root, run chroot /mnt/sysimage.

7. Open a shell, verify that /lib64/libc.so.6 exists in the rescue environment, and copy it back to the original location.

8. Reboot the system; the previously missing commands function again, confirming successful recovery.

Conclusion

If important system files are accidentally removed, rescue mode provides a straightforward way to restore them, as it contains the necessary binaries and libraries for basic operation.