Run Linux(Debian/Ubuntu..) on your Android device. your phone will be a real powerful full functional desktop PC. It is not a parallel Linux system，You can not run Android simultaneously.
Kernel:upstream Linux kerne(>=5.4) + QC-Linaro patch Full X11 Support.
Devices Requirement: 1.Qualcomm chipset:apq8016 msm8916 8992 8994 8996 8998 845 8150 8250 2.your phone need support DisplayPort over USBC,here is list: https://en.everybodywiki.com/List_of_devices_with_video_output_over_USB-C Or USB-OTG with DisplayLink(You need buy a DisplayLink accessory)
Accessory: 1.USBC hub with HDMI out (2+ usb port,Usbc charge support,if it may support audio and ethernet support) 2.USB wifi dongle MT7601（option） 3.Bluetooth dongle(option)
Device support List: Samsung S9/10/20,Note8/8/10 OnePlsu 7,7Pro LG G7,G8,V30,V35,V40,V50 ZTE Axon9,Axon10 HTC U11 U12