I am having the same problem. Unable to upgrade nvidia-rtcore because of this missing package.
Does this package require gcc-10? (or was it because the next release will be based on gcc-10?) Is there any workaround? (short of switching to buster) -- Kind Regards, Atamert Ölçgen ◻◼◻ ◻◻◼ ◼◼◼ www.muhuk.com