Arc Card not loading after reboot

[TheDreadPirate]

You should rollback to Ubuntu's HWE kernel, which is currently 6.11. Keep in mind that LTS releases for Ubuntu are not going to update the base kernel for stability reason. Stability in terms of the OS not crashing and stability in terms of having a stable environment for developers to work on. They back port fixes and security patches to whatever kernel they landed on for the LTS release (6.8 for 24.04). They will provide an optional "Hardware enablement" (HWE) kernel for LTS releases based on the kernel used during the last incremental Ubuntu release (6.11 for Ubuntu 24.10). And Ubuntu published their HWE kernel for 24.04 a couple weeks ago.

Code:

sudo apt install linux-generic-hwe-24.04

That should be all that you need to run to install the 6.11 HWE kernel, including all the kernel modules and kernel headers needed to run Arc properly. But first roll back to 6.8 and remove the mainline kernel and remove the mainline repo.