Running Wi-Fi Access Point while being connected to a wireless network with the same adapter
It's an often requested feature (see https://askubuntu.com/q/318973 and a lot of duplicates shown under Linked at the right) that is not supported in NM currently - when you start access point, the existing wireless network disconnects, simultaneous usage is not supported. Yet most of the hardware in use nowadays seems to be capable of it.
The article https://wiki.archlinux.org/index.php/Software_access_point explains the issue from the technical side and proposes to use a script named create_ap
. While it mostly works, it feels more like a hack than a reliable solution. So I'd be glad to see this feature implemented in Network Manager, the place it belongs to, IMHO.