hello

i cant upgrade my del g15 1511 to the latest uefi dbx 217 that microsoft provided. my laptop is a linux ubuntu system so im not sure why windows has to provide this update. 

the mistake i get is that shim and grub are not to date where i know that everything works just fine with them. i hope i get a solution from those who have the same issue and found a solution

the mistake goes like this:
sudo fwupdmgr update
Devices with no available firmware updates:
• DELL0A71:00 04F3:317E
• UEFI Device Firmware
• UEFI Device Firmware
Devices with the latest available firmware version:
• PM991a NVMe Samsung 512GB
• System Firmware
╔══════════════════════════════════════════════════════════════════════════════╗
║ Upgrade UEFI dbx from 77 to 217? ║
╠══════════════════════════════════════════════════════════════════════════════╣
║ This updates the dbx to the latest release from Microsoft which adds ║
║ insecure versions of grub and shim to the list of forbidden signatures due ║
║ to multiple discovered security updates. ║
║ ║
║ Before installing the update, fwupd will check for any affected executables ║
║ in the ESP and will refuse to update if it finds any boot binaries signed ║
║ with any of the forbidden signatures.If the installation fails, you will ║
║ need to update shim and grub packages before the update can be deployed. ║
║ ║
║ Once you have installed this dbx update, any DVD or USB installer images ║
║ signed with the old signatures may not work correctly.You may have to ║
║ temporarily turn off secure boot when using recovery or installation media, ║
║ if new images have not been made available by your distribution. ║
║ ║
║ UEFI dbx and all connected devices may not be usable while updating. ║
╚══════════════════════════════════════════════════════════════════════════════╝
Perform operation? [Y|n]: y
Downloading… [***************************************]
Downloading… [***************************************]
Decompressing… [***************************************]
Decompressing… [***************************************]
Authenticating… [***************************************]
Authenticating… [***************************************]
Restarting device… [***************************************]
Writing… [***************************************]
Decompressing… [***************************************]
Blocked executable in the ESP, ensure grub and shim are up to date: /boot/efi/efi.factory/boot/bootx64.efi Authenticode checksum [2ea4cb6a1f1eb1d3dce82d54fde26ded243ba3e18de7c6d211902a594fe56788] is present in dbx

please help me