Amazon.com: FriendlyElec Nanopi R5S Mini Router OpenWRT with Three Gbps Ethernet Ports 2GB RAM LPDDR4X Based in RK3399 Soc for IOT NAS Smart Home Gateway (with Metal Case) Support U-Boot Linux Ubuntu :
Turris - Overview
UBUNTU AS ROUTER WITH WEBMIN + MONITOR WIRELESS TRAFFIC WITH WIRESHARK (part 03 / 05) - YouTube
Turris - Overview
SOLVED: Ubuntu laptop creates ad hoc wifi and Android can't connect - Router - iFixit
LinkStar H68K is a pocket-sized router (or mini PC) with Android, OpenWRT, Ubuntu, and Debian support - Liliputing
Creating and Configuring Wi-Fi Hotspot in Ubuntu - GeeksforGeeks