lammps-daily not working


I am using LAMMPS for more than a month. At first, I worked on my laptop. now I am using in my research lab desktop. I have installed in that desktop about 20 days ago. it worked well even yesterday I worked. Today, I have tried to work and now it is saying.

lammps-daily: command not found

My operating system is Ubuntu 18.04.1 LTS

I have uninstalled and then installed again but it is not working. I am following the below website for install ubuntu.

NB: Today my desktop asked for software update and I entered yes.