Ubuntu 24.04 - Kernel 6.8
rpi update does not work with the new kernel 6.8 on ubuntu 24.04: uname -r 6.8.0-1004-raspi
sudo rpi-update You appear to be using a custom kernel file (kernel=vmlinuz in config.txt). Skipping installation of new kernel, as bundled dtb files may be incompatible with your kernel. *** Raspberry Pi firmware updater by Hexxeh, enhanced by AndrewS and Dom *** Performing self-update *** Relaunching after update You appear to be using a custom kernel file (kernel=vmlinuz in config.txt). Skipping installation of new kernel, as bundled dtb files may be incompatible with your kernel. *** Raspberry Pi firmware updater by Hexxeh, enhanced by AndrewS and Dom FW_REV:42312de156405e637a0a171d0cd58b1b2980df11 BOOTLOADER_REV:2bfd7cb74e6bc16559e040d0f5d788a4411819e4 *** Your firmware is already up to date (delete /boot/firmware/.firmware_revision and /boot/firmware/.bootloader_revision to force an update anyway)
Best regards