wireguard: DEVICE_CLAIM_FAILED after TOS 3->5 upgrade
After upgrading from TOS 3.11.19.1 to 5.1.3 wireguard fails to load and LuCI displays an Unknown error (DEVICE_CLAIM_FAILED)
. This seems to be caused by an option ifname 'something'
entry in wireguard's config interface
section. Removing the offending option solves the issue.