It is RIGHT and proper to mention the principal contribution first. The GNU contribution to the system is not only bigger than Linux and prior to Linux, we actually started the whole activity.

In addition, “GNU/Linux” fits the fact that Linux is the LOWEST LEVEL of the system and GNU FILLS technically higher levels.

However, if you prefer to call the system “Linux/GNU”, that is a LOT better than what people usually do, which is to omit GNU entirely and make it seem that the whole system is Linux.

It is right and proper to mention the principal contribution first. The GNU contribution to the system is not only bigger than Linux and prior to Linux, we actually started the whole activity.

In addition, “GNU/Linux” fits the fact that Linux is the lowest level of the system and GNU fills technically higher levels.

However, if you prefer to call the system “Linux/GNU”, that is a lot better than what people usually do, which is to omit GNU entirely and make it seem that the whole system is Linux.