I also find this issue might not just related 28B9.
Another card RTX4090(10de:2717), also could reproduce this issue.
I guess if the card is supported in 535 and 550 at the same time, ubuntu-drivers will only list 535.
RTX 500 Ada (10de:28BA) is only supported in 550, ubuntu-drivers could list the 550 driver successfully.
I also find this issue might not just related 28B9.
Another card RTX4090(10de:2717), also could reproduce this issue.
I guess if the card is supported in 535 and 550 at the same time, ubuntu-drivers will only list 535.
RTX 500 Ada (10de:28BA) is only supported in 550, ubuntu-drivers could list the 550 driver successfully.