KernelCare cannot update kernel in Plesk: Updates already downloaded

Atif Bangash

Updated September 18, 2025 06:30

Plesk for Linux kb: technical ABT: Group A ext: kcare

Applicable to:

Plesk for Linux

Symptoms

The following error occurs in Plesk when trying to update kernel via KernelCare:

Updates already downloaded
insmod: ERROR: could not insert module /var/cache/kcare/modules/none-a01f43d85378dd2d62a009a6ba692314e569bf91/kcare.ko: Required key not available
Unable to load kmod (/var/cache/kcare/modules/none-a01f43d85378dd2d62a009a6ba692314e569bf91/kcare.ko 1)

Cause

Secure boot (UEFI) is used. KernelCare does not support UEFI (Secure Boot) and Signing Kernel Modules.

Resolution

Warning: These steps must be performed by the system administrator and are performed on own risk

Apply one of the following solutions:

Disable secure boot

Steps for Ubuntu can be found here
Steps for Debian can be found here
For RHEL/CentOS operating systems, consult the BIOS documentation

Sign the file /usr/lib/modules/3.10.0-1062.4.1.el7.x86\_64/extra/kcare.ko on your own

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