MB7:
On Manjaro, when I type in “sudo pacman -S linux-headers” it ask me “which one” and if I take “linux516-headers” its not working.
I test KDE on EndeavourOS because on Manjaro its still full of bugs with multi monitor setup and Radeon RX6000 GPU. Now I use Manjaro GNOME with 5.16 Kernel.
For kernel 5.16 you need to install linux516-headers and same terminology is used for other kernels also. Can you switch to 5.15 kernel instead and try there. Also share some sys info:
Trust Level 2) members and above.