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PluginFlag:capsules unsupported
At startup fwupd checks to see if the UEFI UpdateCapsule interface is available. If this is detected, a message is shown with a link to this page.
The WARNING: UEFI capsule updates not available or enabled will show if you are running on a system with no detected entries in the ESRT ACPI table. This is most commonly because the system is correctly running in UEFI mode in the system firmware setup, but "Capsule Updates" has been turned off. This may have been the default setting from the hardware vendor, or may have been done by your systems administrator. Most typically entering the firmware setup screen and enabling capsule updates will cause this warning to disappear, and also make firmware updates possible. The relevant option may be poorly labelled, for example "allow Windows UEFI updates".
This warning can be ignored if UEFI firmware updates are not desired. It can be disabled by adding DisabledPlugins=test;test_ble;invalid;bios to /etc/fwupd/fwupd.conf or recompiling the daemon without UEFI support.
Some older hardware (usually hardware produced before 2015) does not support the ACPI ESRT table. It is possible, but unlikely, that flashing the latest vendor BIOS, using either Windows or a LiveCD, will add support for this table.