If u r a rooted device dont use """"""""su or su root"""""""" just type apt when connected to termux and inst whatever pkg u want  this is a verry complex terminal it's like a mini machine  use apt list to show a list of pkg and if u inst tsu wich is the termux """"""""su"""""""" then u always need tu be uid=0(root tsu) if u want to use apt  long time w8ing 4 something like this. You have a lot of linux features in this """"""""terminal""""""""  thanks.""