Thanks a lot for your reply, installed nethunter apk and placed in root of internal storage after renaming but not detected by chroot(have successfully done it before in Nougat), i personally dislike Linux deploy method so waiting for resolving, i think its a Pie issue. By the way thanks again.
It happens often. Just uninstall and reinstall the terminal using downloaded apk. Search nhterm.apk on google. There you will get the apk in first GitHub link