The issue is that nvidia-settings-experimental-310 and nvidia-settings-experimental-304 both provide the nvidia-settings program, however they do not conflict with one another so dpkg tries to install them concurrently.
As a workaround, you can remove one of these packages, then the install of the other should complete.
The proper fix is for nvidia-settings-experimental-310 to conflict/replace nvidia-settings-experimental-304, or perhaps do something more generic using a conflicts/replaces/provides with a virtual package.
The issue is that nvidia- settings- experimental- 310 and nvidia- settings- experimental- 304 both provide the nvidia-settings program, however they do not conflict with one another so dpkg tries to install them concurrently.
As a workaround, you can remove one of these packages, then the install of the other should complete.
The proper fix is for nvidia- settings- experimental- 310 to conflict/replace nvidia- settings- experimental- 304, or perhaps do something more generic using a conflicts/ replaces/ provides with a virtual package.