According to this commit, DJM 750MK2 is supported since Linux 5.16.
Unfortunately kernel 5.16 isn't available in the stock Ubuntu repositories, but will eventually be available as HWE kernel for Ubuntu 22.04. Before that and on older versions of Ubuntu upgrading a kernel is possible using custom tools such as mainline.
According to this commit, DJM 750MK2 is supported since Linux 5.16.
Unfortunately kernel 5.16 isn't available in the stock Ubuntu repositories, but will eventually be available as HWE kernel for Ubuntu 22.04. Before that and on older versions of Ubuntu upgrading a kernel is possible using custom tools such as mainline.