Enable Hacker's Keyboard by going to System Settings app → Languages and Input → On-screen keyboard → Manage keyboard → Hacker's Keyboard → OK
Change current keyboard to Hacker's Keyboard by going to System Settings app → Languages and Input → On-screen keyboard → Default keyboard → Hacker's Keyboard
Show the Ctrl,Alt,Fn buttons by long-click the mic button where you typing something, then go to Keyboard mode, potrait, change it to Full 5-row layout
Show the keyboard anywhere, anytime by long-click the mic button where you typing something, then enable the Show permanent notification option