Updating Kernel on Raspberry Pi Requires Manual Intervention
July 21, 2021
The mainline kernel and boot firmware for Raspberry Pi have been updated, and we added a LTS kernel flavor (5.10).
Because we have switched to the mainstream kernel update policy, please uninstall linux-kernel-rpi64 and install
linux+kernel+rpi64 (or linux+kernel+rpi64+lts if you want to use LTS kernel) before updating the kernel.
— Kaiyang Wu, Xinhui Yang